diff --git a/apps/api/src/routes/classroom.ts b/apps/api/src/routes/classroom.ts
index c0f33e6..4bd0af7 100644
--- a/apps/api/src/routes/classroom.ts
+++ b/apps/api/src/routes/classroom.ts
@@ -3,6 +3,7 @@ import {
   STUDENT_ROLES,
   classLessonRequestSchema,
   type ClassActivity,
+  type ClassToday,
   type ClassBoard,
   type ClassBoardStudent,
   type ClassLesson,
@@ -762,6 +763,100 @@ classroomRoutes.get("/classroom/board", requireTeacher, async (c) => {
   } satisfies ClassBoard)
 })
 
+/**
+ * 老师首页「今天的课」：今天在上课的每个班一行。在上课 = 同班 ≥5 人今天一起交过题（和「班里在做」
+ * 同一个门槛），或者老师今天在看板上布置过题（刚布置、还没人交也要列出来）。每个班的题和人数
+ * 和看板同一套取法（classLessonProblems），「全做对」看这几道题做没做对过，不限今天
+ */
+classroomRoutes.get("/classroom/today", requireTeacher, async (c) => {
+  const start = dayStart()
+  const today = calendarDay()
+  const activity = activityRows({ since: start })
+  const users = sql<number>`count(distinct ${activity.userId})::int`
+  const lastAt = sql<string>`max(${activity.createTime})`
+  const [active, lessons] = await Promise.all([
+    db
+      .select({ className: schema.user.className, users, lastAt })
+      .from(activity)
+      .innerJoin(schema.user, eq(schema.user.id, activity.userId))
+      .where(
+        and(
+          isNotNull(schema.user.className),
+          eq(schema.user.isDisabled, false),
+          inArray(schema.user.adminType, [...STUDENT_ROLES]),
+        ),
+      )
+      .groupBy(schema.user.className),
+    db
+      .select({ className: schema.classLesson.className })
+      .from(schema.classLesson)
+      .where(eq(schema.classLesson.day, today)),
+  ])
+  const activeByClass = new Map(
+    active
+      .filter((row) => row.className && row.users >= CLASS_ACTIVITY_MIN_USERS)
+      .map((row) => [row.className!, row]),
+  )
+  const names = [...new Set([...activeByClass.keys(), ...lessons.map((row) => row.className)])]
+
+  const classes = await Promise.all(
+    names.map(async (className) => {
+      const [lesson, [roster]] = await Promise.all([
+        classLessonProblems(className, 1),
+        db
+          .select({ value: sql<number>`count(*)::int` })
+          .from(schema.user)
+          .where(
+            and(
+              eq(schema.user.className, className),
+              eq(schema.user.isDisabled, false),
+              inArray(schema.user.adminType, [...STUDENT_ROLES]),
+            ),
+          ),
+      ])
+      const ids = lesson.problems.map((problem) => problem.id)
+      let allDoneCount = 0
+      if (ids.length) {
+        // 做没做对不限今天（和看板的格子一样：以前做对的也算做完），语言跟着布置走
+        const done = activityRows({
+          since: new Date(0).toISOString(),
+          users: classMemberIds(className),
+          problemIds: ids,
+          language: lesson.language,
+        })
+        const rows = await db
+          .select({
+            userId: done.userId,
+            solved: sql<number>`count(distinct ${done.problemId})::int`,
+          })
+          .from(done)
+          .where(sql`${done.solved}`)
+          .groupBy(done.userId)
+        allDoneCount = rows.filter((row) => row.solved >= ids.length).length
+      }
+      const today = activeByClass.get(className)
+      return {
+        className,
+        source: lesson.source,
+        assignedAt: lesson.assignedAt,
+        problems: lesson.problems.map((problem) => ({
+          problemDisplayId: problem.displayId,
+          title: problem.title,
+          userCount: problem.userCount,
+          acceptedCount: problem.acceptedCount,
+        })),
+        activeCount: today?.users ?? 0,
+        rosterCount: roster?.value ?? 0,
+        allDoneCount,
+        lastSubmitAt: today?.lastAt ? new Date(today.lastAt).toISOString() : null,
+      }
+    }),
+  )
+  // 正在交的在前，只布置了还没人交的放最后
+  classes.sort((a, b) => (b.lastSubmitAt ?? "").localeCompare(a.lastSubmitAt ?? ""))
+  return success(c, { classes } satisfies ClassToday)
+})
+
 /**
  * 提交列表「这节课」按钮：这个班这节课是哪几道题，取法同课堂看板（老师布置的优先，
  * 否则按今天同班提交推断）。不传班级就猜最近两小时在交题的班
diff --git a/packages/contract/src/classroom.ts b/packages/contract/src/classroom.ts
index 9ff319b..e8b3080 100644
--- a/packages/contract/src/classroom.ts
+++ b/packages/contract/src/classroom.ts
@@ -185,7 +185,38 @@ export const classLessonSchema = z.object({
   problems: z.array(z.object({ problemDisplayId: z.string(), title: z.string() })),
 })
 
+/**
+ * 老师首页「今天的课」：今天在上课的每个班一行（同班 ≥5 人一起交题，或者老师在看板上布置过）。
+ * 题目的人数是今天的（和看板同一套取法），「全做对」看的是这几道题有没有做对过，不限今天
+ */
+export const classTodaySchema = z.object({
+  classes: z.array(
+    z.object({
+      className: z.string(),
+      source: z.enum(["teacher", "inferred"]).nullable(),
+      /** 老师布置的时刻；推断出来的为 null */
+      assignedAt: z.string().nullable(),
+      problems: z.array(
+        z.object({
+          problemDisplayId: z.string(),
+          title: z.string(),
+          userCount: z.number().int(),
+          acceptedCount: z.number().int(),
+        }),
+      ),
+      /** 今天交过题的人数 / 全班人数 */
+      activeCount: z.number().int(),
+      rosterCount: z.number().int(),
+      /** 这节课的题全做对了的人数 */
+      allDoneCount: z.number().int(),
+      /** 今天最后一次有人交题；还没人交（只布置了）为 null */
+      lastSubmitAt: z.string().nullable(),
+    }),
+  ),
+})
+
 export type ClassActivity = z.infer<typeof classActivitySchema>
+export type ClassToday = z.infer<typeof classTodaySchema>
 export type LastVisit = z.infer<typeof lastVisitSchema>
 export type ClassLessonRequest = z.infer<typeof classLessonRequestSchema>
 export type ClassBoard = z.infer<typeof classBoardSchema>