diff --git a/yunke-server/app/api/routers/groups.py b/yunke-server/app/api/routers/groups.py
index b5c2e69..9bafa3c 100644
--- a/yunke-server/app/api/routers/groups.py
+++ b/yunke-server/app/api/routers/groups.py
@@ -35,19 +35,23 @@ async def list_groups(
     channel: Annotated[str | None, Query()] = None,
     owner_account_id: Annotated[str | None, Query()] = None,
     user_id: Annotated[str | None, Query()] = None,
+    room_id: Annotated[str | None, Query()] = None,
 ) -> Page[GroupOut]:
     """List chat groups with optional ``channel`` / ``owner_account_id`` /
-    ``user_id`` filters.
+    ``user_id`` / ``room_id`` filters.
 
     ``user_id`` maps to the ``ChatGroup.owner_user_id`` column (the staff
     ``userId`` who owns the chatroom account), mirroring the ``user_id``
-    filter on ``GET /api/customers``.
+    filter on ``GET /api/customers``. ``room_id`` is an exact-match single-
+    row lookup (chat page group-name resolution).
     """
     conditions = []
     if channel is not None:
         conditions.append(ChatGroup.channel == channel)
     if owner_account_id is not None:
         conditions.append(ChatGroup.owner_account_id == owner_account_id)
+    if room_id is not None:
+        conditions.append(ChatGroup.room_id == room_id)
     if user_id is not None:
         conditions.append(ChatGroup.owner_user_id == user_id)
 
diff --git a/yunke-server/tests/test_api_groups.py b/yunke-server/tests/test_api_groups.py
index 5ad1e6e..d54ed8d 100644
--- a/yunke-server/tests/test_api_groups.py
+++ b/yunke-server/tests/test_api_groups.py
@@ -235,3 +235,23 @@ async def test_members_empty_room_is_200(make_client):
     r = await client.get("/api/groups/room_b@chatroom/members")
     assert r.status_code == 200
     assert r.json() == []
+
+
+# ---------------------------------------------------------------------------
+# room_id 精确过滤（2026-08-20：群聊页群名单行直查,替代超上限的大页拉取）
+# ---------------------------------------------------------------------------
+
+async def test_room_id_filter_returns_single_group(make_client):
+    async def seed(session):
+        session.add_all([
+            ChatGroup(room_id="r1@chatroom", channel="wechat", room_name="群一", owner_account_id="o1"),
+            ChatGroup(room_id="r2@chatroom", channel="wechat", room_name="群二", owner_account_id="o1"),
+        ])
+        await session.commit()
+
+    client = await make_client(seed)
+    r = await client.get("/api/groups", params={"room_id": "r2@chatroom"})
+    assert r.status_code == 200
+    body = r.json()
+    assert body["total"] == 1
+    assert body["items"][0]["room_name"] == "群二"
diff --git a/yunkes/src/api/index.ts b/yunkes/src/api/index.ts
index 838c169..1ceb316 100644
--- a/yunkes/src/api/index.ts
+++ b/yunkes/src/api/index.ts
@@ -140,6 +140,8 @@ export interface GroupQuery {
   channel?: Channel | 'all'
   owner_account_id?: string
   user_id?: string
+  /** 精确单行直查（群聊页群名解析）。 */
+  room_id?: string
   page?: number
   page_size?: number
 }
@@ -151,6 +153,7 @@ export function getGroups(query: GroupQuery = {}): Promise<Page<Group>> {
       channel: query.channel === 'all' ? undefined : query.channel,
       owner_account_id: query.owner_account_id,
       user_id: query.user_id,
+      room_id: query.room_id,
       page: query.page ?? 1,
       page_size: query.page_size ?? 20,
     }),
diff --git a/yunkes/src/views/ChatTimeline.vue b/yunkes/src/views/ChatTimeline.vue
index 38474b6..9bc9ba3 100644
--- a/yunkes/src/views/ChatTimeline.vue
+++ b/yunkes/src/views/ChatTimeline.vue
@@ -76,10 +76,9 @@ async function loadTalkerName(): Promise<void> {
   if (!hasActive.value) return
   try {
     if (isGroup.value && props.roomId) {
-      // 群名
-      const res = await getGroups({ channel: channelTyped.value, owner_account_id: props.ownerId, page: 1, page_size: 200 })
-      const g = res.items.find(g => g.room_id === props.roomId)
-      talkerName.value = g?.room_name || null
+      // 群名(room_id 精确单行直查,不再拉整页群列表)
+      const res = await getGroups({ channel: channelTyped.value, room_id: props.roomId, page: 1, page_size: 1 })
+      talkerName.value = res.items[0]?.room_name || null
     } else if (props.talkerId) {
       // 客户昵称
       const res = await getCustomers({