diff --git a/pipeline_service/communication.py b/pipeline_service/communication.py
index 0ab01b2..727f7f7 100644
--- a/pipeline_service/communication.py
+++ b/pipeline_service/communication.py
@@ -82,6 +82,37 @@ async def raise_problem(problem_type, question, from_role, from_agentid="",
                 return ""
         hr = first_handler_role or "agent.main_agent"
         ha = first_handler_agentid or ""
+        # 重复冒泡去重（2026-09-15 用户指令「避免重复」）：同任务+同问题类型已有
+        # pending 问题 → 不新建，把正文/context 更新到既有行并返回既有 qid。
+        # 实测历史数据：同 task_id 的 qc_reject/review_reject/fault_report 各堆 2~3 条
+        # pending（每轮退回都新发一条，旧的不答结），角标虚高、用户重复看到同一事项。
+        _tk = (task_id or '').strip()
+        if _tk and problem_type:
+            _dup = await sor.sqlExe(
+                "SELECT id FROM pipeline_agent_questions WHERE task_id=${tk}$ "
+                "AND problem_type=${pt}$ AND status='pending' "
+                "ORDER BY created_at DESC LIMIT 1",
+                {"tk": _tk, "pt": problem_type})
+            await sor.sqlExe("COMMIT", {})
+            if _dup:
+                old_qid = getattr(_dup[0], 'id', '')
+                _ctx2 = dict(context or {})
+                if form_schema:
+                    _ctx2['form_schema'] = form_schema
+                await sor.sqlExe(
+                    "UPDATE pipeline_agent_questions SET question=${q}$, context=${c}$, "
+                    "updated_at=NOW() WHERE id=${i}$",
+                    {"q": question or '', "c": json.dumps(_ctx2, ensure_ascii=False, default=str)
+                     if _ctx2 else None, "i": old_qid})
+                await sor.sqlExe("COMMIT", {})
+                if suspend_task:
+                    await sor.sqlExe(
+                        "UPDATE pipeline_tasks SET state='waiting', claimed_by=NULL WHERE id=${tid}$",
+                        {"tid": _tk})
+                    await sor.sqlExe("COMMIT", {})
+                logger.info("raise_problem dedup: task=%s type=%s reuse qid=%s",
+                            _tk, problem_type, old_qid)
+                return old_qid
         qid = getID()
         # form_schema 并入 context 存储（待办详情按它渲染动态表单）
         if form_schema: