diff --git a/apps/api/src/routes/submission.ts b/apps/api/src/routes/submission.ts
index 04385b7..8e9cbec 100644
--- a/apps/api/src/routes/submission.ts
+++ b/apps/api/src/routes/submission.ts
@@ -10,6 +10,7 @@ import {
   type SubmissionListItem,
   type SubmissionStatistics,
   type SubmissionStatisticsItems,
+  type TodaySubmissionStatistics,
 } from "@oj2/contract"
 import { and, count, desc, eq, gt, ilike, inArray, isNull, or, sql, type SQL } from "drizzle-orm"
 import { Hono } from "hono"
@@ -36,7 +37,7 @@ import {
 import { CodeFormatError, formatCode } from "../services/format-code"
 import { getBooleanOption } from "../services/options"
 import { consumeToken } from "../services/throttling"
-import { todayStart } from "../time"
+import { localTime, todayStart } from "../time"
 import {
   asFilterValue,
   isAdminRole,
@@ -182,6 +183,100 @@ function judgedRate(accepted: number, judged: number) {
   return judged > 0 ? rounded((accepted / judged) * 100) : 0
 }
 
+/**
+ * 「今日提交数」标签点开的统计。**公开、只出聚合数**（没有用户名、没有代码，
+ * 热门题只算公开可见的题），口径和那颗标签一致：东八区今天 + 非比赛提交。
+ *
+ * 按钟点切用 `localTime()`，不能写 `extract(hour from create_time)` ——
+ * 后者按数据库会话时区算，容器是 UTC，整张分布图会整体左移 8 小时。
+ */
+submissionRoutes.get("/submissions/today-statistics", optionalAuth, async (c) => {
+  /**
+   * 「提交列表对学生全开」关掉时（考试那种场合）不给热门题这张表 —— 总数、正确率
+   * 这些聚合数原本就从公开的 today-count 看得出来，但「哪几道题在被刷」已经贴近
+   * 提交列表本身的内容了，得跟着同一个开关走。数字照给，不然标签说 21、弹框说 0。
+   */
+  const showProblems =
+    (await getBooleanOption("submission_list_show_all", true)) || isAdminRole(c.get("user"))
+  const where = and(
+    isNull(schema.submission.contestId),
+    sql`${schema.submission.createTime} >= ${todayStart()}`,
+  )
+  const acceptedFilter = sql`count(*) filter (where ${inArray(schema.submission.result, ACCEPTED_RESULTS)})`
+  const judgingFilter = sql`count(*) filter (where ${inArray(schema.submission.result, UNJUDGED_RESULTS)})`
+  const hour = sql<number>`extract(hour from ${localTime(schema.submission.createTime)})::int`
+
+  const [[totals], hourRows, languageRows, resultRows, problemRows] = await Promise.all([
+    db
+      .select({
+        total: count(),
+        accepted: acceptedFilter.mapWith(Number),
+        judging: judgingFilter.mapWith(Number),
+        userCount: sql<number>`count(distinct ${schema.submission.userId})`.mapWith(Number),
+      })
+      .from(schema.submission)
+      .where(where),
+    db
+      .select({ hour, value: count() })
+      .from(schema.submission)
+      .where(where)
+      .groupBy(hour),
+    db
+      .select({ language: schema.submission.language, value: count() })
+      .from(schema.submission)
+      .where(where)
+      .groupBy(schema.submission.language)
+      .orderBy(desc(count())),
+    db
+      .select({ result: schema.submission.result, value: count() })
+      .from(schema.submission)
+      .where(where)
+      .groupBy(schema.submission.result)
+      .orderBy(desc(count())),
+    showProblems
+      ? db
+          .select({
+            displayId: schema.problem.displayId,
+            title: schema.problem.title,
+            value: count(),
+            accepted: acceptedFilter.mapWith(Number),
+          })
+          .from(schema.submission)
+          .innerJoin(schema.problem, eq(schema.problem.id, schema.submission.problemId))
+          // 隐藏题目不出现在这张表里：接口不需要登录，标题本身就是不该外露的东西
+          .where(and(where, eq(schema.problem.visible, true)))
+          .groupBy(schema.problem.id, schema.problem.displayId, schema.problem.title)
+          .orderBy(desc(count()))
+          .limit(10)
+      : [],
+  ])
+
+  const total = totals?.total ?? 0
+  const judging = totals?.judging ?? 0
+  const hours = Array.from({ length: 24 }, () => 0)
+  for (const row of hourRows) hours[row.hour] = row.value
+
+  return success(
+    c,
+    {
+      total,
+      accepted: totals?.accepted ?? 0,
+      judging,
+      correctRate: judgedRate(totals?.accepted ?? 0, total - judging),
+      userCount: totals?.userCount ?? 0,
+      hours,
+      languages: languageRows.map((row) => ({ language: row.language, count: row.value })),
+      results: resultRows.map((row) => ({ result: row.result, count: row.value })),
+      problems: problemRows.map((row) => ({
+        problem: row.displayId,
+        problemTitle: row.title,
+        count: row.value,
+        acceptedCount: row.accepted,
+      })),
+    } satisfies TodaySubmissionStatistics,
+  )
+})
+
 /**
  * 统计接口共用的时间窗解析。旧后端 `end` 必填、`start` 可选（不给就是「全部时段」）。
  */
diff --git a/apps/web/src/oj/api.ts b/apps/web/src/oj/api.ts
index 10e9699..0cd0eb3 100644
--- a/apps/web/src/oj/api.ts
+++ b/apps/web/src/oj/api.ts
@@ -38,6 +38,7 @@ import {
   type FlowchartStatistics,
   type SubmissionStatistics,
   type SubmissionStatisticsItems,
+  type TodaySubmissionStatistics,
 } from "@oj2/contract"
 import api from "utils/api"
 import { contract } from "utils/contract"
@@ -159,6 +160,11 @@ export function getTodaySubmissionCount(language?: string) {
   return api.get<number>("submissions/today-count", { params: { language } })
 }
 
+/** 「今日提交数」标签点开的统计。公开接口，口径同那颗标签：今天 + 非比赛提交 */
+export function getTodaySubmissionStatistics() {
+  return api.get<TodaySubmissionStatistics>("submissions/today-statistics")
+}
+
 export function adminRejudge(id: string) {
   return api.post<{ ok: boolean }>(
     `submissions/${encodeURIComponent(id)}/rejudge`,
diff --git a/apps/web/src/oj/submission/components/TodayStatistics.vue b/apps/web/src/oj/submission/components/TodayStatistics.vue
new file mode 100644
index 0000000..625ad64
--- /dev/null
+++ b/apps/web/src/oj/submission/components/TodayStatistics.vue
@@ -0,0 +1,253 @@
+<script setup lang="ts">
+import { useThemeVars } from "naive-ui"
+import { getTodaySubmissionStatistics } from "oj/api"
+import { LANGUAGE_SHOW_VALUE } from "utils/constants"
+import { zonedParts } from "utils/functions"
+import SubmissionResultTag from "shared/components/SubmissionResultTag.vue"
+import type { TodaySubmissionStatistics } from "@oj2/contract"
+
+const emit = defineEmits<{ openProblem: [problem: string] }>()
+
+const themeVars = useThemeVars()
+
+const stats = ref<TodaySubmissionStatistics | null>(null)
+const loading = ref(true)
+
+// 柱子高度用的像素上限。CSS 里 .hour-bars 的高度跟着它
+const BAR_MAX_HEIGHT = 72
+
+// 「现在是几点」按东八区取，不跟浏览器时区走 —— 高亮错一格比不高亮更糟
+const currentHour = zonedParts(new Date())!.hour
+
+const maxHour = computed(() => Math.max(1, ...(stats.value?.hours ?? [])))
+const maxLanguage = computed(() =>
+  Math.max(1, ...(stats.value?.languages ?? []).map((row) => row.count)),
+)
+
+/** 0 条的钟点不画柱子，横轴那条基线本身就代表「这个钟点没人交」 */
+function barHeight(value: number) {
+  if (value <= 0) return "0px"
+  return `${Math.max(4, Math.round((value / maxHour.value) * BAR_MAX_HEIGHT))}px`
+}
+
+onMounted(async () => {
+  try {
+    stats.value = await getTodaySubmissionStatistics()
+  } finally {
+    loading.value = false
+  }
+})
+</script>
+
+<template>
+  <n-spin :show="loading">
+    <n-empty
+      v-if="stats && stats.total === 0"
+      description="今天还没有人提交"
+      style="margin: 40px 0"
+    />
+    <template v-else-if="stats">
+      <n-flex justify="space-around">
+        <div class="stat-item">
+          <n-text>总提交</n-text>
+          <n-gradient-text type="info" font-size="28">
+            {{ stats.total }}
+          </n-gradient-text>
+        </div>
+        <div class="stat-item">
+          <n-text>正确提交</n-text>
+          <n-gradient-text type="primary" font-size="28">
+            {{ stats.accepted }}
+          </n-gradient-text>
+        </div>
+        <div class="stat-item" v-if="stats.judging > 0">
+          <n-text>判题中</n-text>
+          <n-gradient-text type="info" font-size="28">
+            {{ stats.judging }}
+          </n-gradient-text>
+        </div>
+        <div class="stat-item">
+          <n-text>正确率</n-text>
+          <n-gradient-text type="warning" font-size="28">
+            {{ stats.correctRate }}%
+          </n-gradient-text>
+        </div>
+        <div class="stat-item">
+          <n-text>参与人数</n-text>
+          <n-gradient-text type="error" font-size="28">
+            {{ stats.userCount }}
+          </n-gradient-text>
+        </div>
+      </n-flex>
+
+      <n-divider style="margin: 16px 0">按小时</n-divider>
+      <div class="hours">
+        <div class="hour" v-for="(value, hour) in stats.hours" :key="hour">
+          <n-tooltip>
+            <template #trigger>
+              <!--
+                基线是每一格自己的下边框拼出来的（整条横轴一根 border 也行，但那样
+                「现在」这一格就没法单独加粗）。**现在这一格加粗成主色**，
+                原来是给整格垫一层底色，结果那块浅灰看着就像一根柱子。
+              -->
+              <div
+                class="hour-bars"
+                :style="{
+                  borderBottomColor:
+                    hour === currentHour
+                      ? themeVars.primaryColor
+                      : themeVars.dividerColor,
+                }"
+              >
+                <div
+                  class="bar"
+                  :style="{
+                    height: barHeight(value),
+                    backgroundColor: themeVars.primaryColor,
+                  }"
+                ></div>
+              </div>
+            </template>
+            {{ hour }}:00 - {{ hour }}:59 共 {{ value }} 条
+          </n-tooltip>
+          <!-- 每 3 小时标一个刻度。标签占位始终留着，柱子才对得齐 -->
+          <div class="hour-label">{{ hour % 3 === 0 ? hour : "" }}</div>
+        </div>
+      </div>
+
+      <n-divider style="margin: 16px 0">按语言</n-divider>
+      <div class="rows">
+        <div class="row" v-for="row in stats.languages" :key="row.language">
+          <n-text class="row-name">{{
+            LANGUAGE_SHOW_VALUE[row.language]
+          }}</n-text>
+          <n-progress
+            class="row-bar"
+            type="line"
+            :percentage="(row.count / maxLanguage) * 100"
+            :show-indicator="false"
+            :height="10"
+          />
+          <n-text class="row-count">{{ row.count }}</n-text>
+        </div>
+      </div>
+
+      <n-divider style="margin: 16px 0">按状态</n-divider>
+      <n-flex align="center">
+        <n-flex
+          align="center"
+          :size="4"
+          v-for="row in stats.results"
+          :key="row.result"
+        >
+          <SubmissionResultTag :result="row.result" />
+          <n-text>{{ row.count }}</n-text>
+        </n-flex>
+      </n-flex>
+
+      <template v-if="stats.problems.length">
+        <n-divider style="margin: 16px 0">今天最热的题</n-divider>
+        <div class="rows">
+          <div class="row" v-for="row in stats.problems" :key="row.problem">
+            <n-button
+              class="problem"
+              text
+              type="info"
+              @click="emit('openProblem', row.problem)"
+            >
+              {{ row.problem }} {{ row.problemTitle }}
+            </n-button>
+            <n-text class="row-count" depth="3">
+              {{ row.count }} 条 / 正确 {{ row.acceptedCount }}
+            </n-text>
+          </div>
+        </div>
+      </template>
+    </template>
+    <!-- 请求失败时 stats 还是 null，转圈停下来总得留句话 -->
+    <n-empty
+      v-else-if="!loading"
+      description="统计拉取失败"
+      style="margin: 40px 0"
+    />
+    <div v-else style="height: 200px"></div>
+  </n-spin>
+</template>
+
+<style scoped>
+.stat-item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 4px;
+}
+
+.hours {
+  display: flex;
+  align-items: flex-end;
+  gap: 2px;
+}
+
+.hour {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 4px;
+}
+
+.hour-bars {
+  height: 72px;
+  width: 100%;
+  display: flex;
+  align-items: flex-end;
+  cursor: default;
+  /* 每格一段，拼成整条横轴。「现在」那一格换主色，粗细不动 —— 变粗会让那一格的
+     柱子底比别人高 1px */
+  border-bottom: 2px solid;
+}
+
+.bar {
+  width: 100%;
+  border-radius: 2px 2px 0 0;
+  transition: height 0.2s;
+}
+
+.hour-label {
+  font-size: 11px;
+  line-height: 14px;
+  opacity: 0.6;
+}
+
+.rows {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.row {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.row-name {
+  width: 72px;
+  flex-shrink: 0;
+}
+
+.row-bar {
+  flex: 1;
+}
+
+.row-count {
+  flex-shrink: 0;
+  font-variant-numeric: tabular-nums;
+}
+
+.problem {
+  flex: 1;
+  justify-content: flex-start;
+  overflow: hidden;
+}
+</style>
diff --git a/apps/web/src/oj/submission/list.vue b/apps/web/src/oj/submission/list.vue
index 1d76071..046c40b 100644
--- a/apps/web/src/oj/submission/list.vue
+++ b/apps/web/src/oj/submission/list.vue
@@ -49,6 +49,9 @@ const StatisticsPanel = defineAsyncComponent(
 const FlowchartStatisticsPanel = defineAsyncComponent(
   () => import("shared/components/FlowchartStatisticsPanel.vue"),
 )
+const TodayStatistics = defineAsyncComponent(
+  () => import("./components/TodayStatistics.vue"),
+)
 const SubmissionDetail = defineAsyncComponent(() => import("./detail.vue"))
 const FlowchartScoreDetail = defineAsyncComponent(
   () => import("./components/FlowchartScoreDetail.vue"),
@@ -114,6 +117,8 @@ const { query, clearQuery } = usePagination<SubmissionQuery>({
 const submissionID = ref("")
 const problemDisplayID = ref("")
 const [statisticPanel, toggleStatisticPanel] = useToggle(false)
+// 「今日提交数」旁边那颗「统计」按钮的弹框
+const [todayPanel, toggleTodayPanel] = useToggle(false)
 
 const [codePanel, toggleCodePanel] = useToggle(false)
 const [scoreDetailPanel, toggleScoreDetailPanel] = useToggle(false)
@@ -241,6 +246,12 @@ function problemClicked(row: SubmissionListItem | FlowchartSubmissionListItem) {
   }
 }
 
+// 今日统计弹框里点题目。那颗按钮只在 route.name === "submissions" 上出现
+// （今日提交数本身就只在那一页拉），所以不用管比赛里的题目路由
+function openProblem(displayId: string) {
+  window.open("/problem/" + displayId, "_blank")
+}
+
 function showCodePanel(id: string, problem: string) {
   toggleCodePanel(true)
   submissionID.value = id
@@ -581,19 +592,33 @@ const flowchartColumns = computed(() => {
           </n-button>
         </n-form-item>
       </n-form>
-      <n-tag
-        v-if="todayCount > 0"
-        checkable
-        :checked="query.today === '1'"
-        type="success"
-        size="large"
-        @update:checked="(v: boolean) => (query.today = v ? '1' : '0')"
-      >
-        <n-gradient-text v-if="query.today !== '1'" type="success">
-          今日提交数：{{ todayCount }}
-        </n-gradient-text>
-        <template v-else>今日提交数：{{ todayCount }}</template>
-      </n-tag>
+      <n-flex v-if="todayCount > 0" align="center" :size="8">
+        <n-tag
+          checkable
+          :checked="query.today === '1'"
+          type="success"
+          size="large"
+          @update:checked="(v: boolean) => (query.today = v ? '1' : '0')"
+        >
+          <n-gradient-text v-if="query.today !== '1'" type="success">
+            今日提交数：{{ todayCount }}
+          </n-gradient-text>
+          <template v-else>今日提交数：{{ todayCount }}</template>
+        </n-tag>
+        <!--
+          筛到今天之后才出现。流程图那档不给 —— 这个统计只算代码提交
+          （流程图提交在另一张表、只有 AI 评级没有判题状态），点开会是一份
+          对不上标签数字的统计。
+        -->
+        <n-button
+          v-if="query.today === '1' && query.language !== 'Flowchart'"
+          quaternary
+          type="success"
+          @click="toggleTodayPanel(true)"
+        >
+          统计
+        </n-button>
+      </n-flex>
     </n-space>
     <n-data-table
       v-if="query.language === 'Flowchart'"
@@ -636,6 +661,15 @@ const flowchartColumns = computed(() => {
       :username="query.username"
     />
   </n-modal>
+  <n-modal
+    v-model:show="todayPanel"
+    preset="card"
+    :style="{ maxWidth: isDesktop && '700px', maxHeight: '80vh' }"
+    :content-style="{ overflow: 'auto' }"
+    title="今日提交统计"
+  >
+    <TodayStatistics @open-problem="(id: string) => openProblem(id)" />
+  </n-modal>
   <n-modal
     v-model:show="codePanel"
     preset="card"
diff --git a/packages/contract/src/submission.ts b/packages/contract/src/submission.ts
index 3551e3a..3c4243f 100644
--- a/packages/contract/src/submission.ts
+++ b/packages/contract/src/submission.ts
@@ -331,6 +331,52 @@ export const submissionStatisticsSchema = z.object({
   dataAttempted: z.array(attemptedStudentSchema),
 })
 
+/**
+ * 提交列表那颗「今日提交数」标签点开之后的统计弹框（GET /submissions/today-statistics）。
+ *
+ * **公开接口，只下发聚合数** —— 没有用户名、没有代码、没有隐藏题目的标题，学生和
+ * 匿名访客看到的和教师一样。教师那套按班级/按题号钻取的口径在
+ * `submissionStatisticsSchema`，两者不是一回事，别把这个当它的简版去加字段。
+ *
+ * 口径跟着那颗标签走：**东八区今天、非比赛提交、不分语言**（语言分布就是
+ * `languages` 这张表本身）。
+ */
+export const todaySubmissionStatisticsSchema = z.object({
+  total: z.number().int(),
+  /** 通过的条数，含 AST_CHECK_FAILED（那也是答案对了） */
+  accepted: z.number().int(),
+  /**
+   * 还没判完的条数（PENDING / JUDGING）。`total` 把它算在内，`correctRate` 的分母
+   * 不算 —— 全班同时交卷的那几秒，分母涨了分子没涨，正确率会凭空掉一截。
+   */
+  judging: z.number().int(),
+  correctRate: z.number(),
+  /** 今天交过东西的人数，按 user_id 去重 */
+  userCount: z.number().int(),
+  /** 按东八区钟点分的 24 个桶，**下标就是钟点**，没有提交的钟点是 0 */
+  hours: z.array(z.number().int()).length(24),
+  /** 按语言，提交数倒序。零提交的语言不在表里 */
+  languages: z.array(
+    z.object({ language: problemLanguageSchema, count: z.number().int() }),
+  ),
+  /** 按判题结果，条数倒序 */
+  results: z.array(
+    z.object({ result: judgeStatusSchema, count: z.number().int() }),
+  ),
+  /**
+   * 今天最热的几道题，提交数倒序，最多 10 道。
+   * **只含公开可见的题目** —— 这个接口不需要登录，不能拿它探未发布题目的标题。
+   */
+  problems: z.array(
+    z.object({
+      problem: z.string(),
+      problemTitle: z.string(),
+      count: z.number().int(),
+      acceptedCount: z.number().int(),
+    }),
+  ),
+})
+
 export const formatCodeRequestSchema = z.object({
   code: z.string().max(1024 * 1024),
   language: z.enum(["python", "c", "cpp", "sql"]),
@@ -346,6 +392,9 @@ export type CreateSubmissionRequest = z.infer<
 export type SubmissionDetail = z.infer<typeof submissionDetailSchema>
 export type SubmissionUpdate = z.infer<typeof submissionUpdateSchema>
 export type SubmissionStatistics = z.infer<typeof submissionStatisticsSchema>
+export type TodaySubmissionStatistics = z.infer<
+  typeof todaySubmissionStatisticsSchema
+>
 export type SubmissionStatisticsUser = z.infer<
   typeof submissionStatisticsUserSchema
 >