diff --git a/apps/api/app/services/lipsync_service.py b/apps/api/app/services/lipsync_service.py
index 442b2c970..283c6f032 100644
--- a/apps/api/app/services/lipsync_service.py
+++ b/apps/api/app/services/lipsync_service.py
@@ -198,6 +198,12 @@ class LipsyncService:
         self.db.add(job)
         self.db.flush()
 
+        # ⚠️ 必须先 commit 再发 Celery 任务，避免事务竞态：
+        # worker 是独立进程+独立DB连接，任务被消费（<4ms）时若本事务还未提交，
+        # worker 查询 job 会返回 None → 静默 return 不重试，job 永远卡在 tts_processing。
+        self.db.commit()
+        self.db.refresh(job)
+
         if is_tts_mode:
             # 2a. TTS 模式：dispatch Celery 异步任务处理 TTS 合成 + MediaKit 提交
             try:
@@ -223,6 +229,7 @@ class LipsyncService:
                 job.error_message = f"Celery 任务投递失败: {exc}"
                 job.error_code = "AsyncDispatchFailed"
                 job.updated_at = datetime.now(timezone.utc)
+                self.db.commit()  # 投递失败也要落库失败状态
         else:
             # 2b. 直接音频模式：同步签名并提交 MediaKit
             video_url = self._sign_media_url(video_url)
@@ -240,15 +247,15 @@ class LipsyncService:
                 job.mediakit_task_id = result["task_id"]
                 job.status = "submitted"
                 job.submitted_at = datetime.now(timezone.utc)
+                self.db.commit()  # submitted 状态落库
             except MediaKitError as exc:
                 job.status = "failed"
                 job.error_message = str(exc)
                 job.error_code = exc.code
                 logger.error("提交对口型任务失败: %s", exc)
+                self.db.commit()
                 raise
 
-        self.db.commit()
-        self.db.refresh(job)
         return job
 
     # ── 查询任务 ──────────────────────────────────────────────────────────
diff --git a/apps/api/app/tasks/lipsync_tts.py b/apps/api/app/tasks/lipsync_tts.py
index 1b3ef0dfc..7651911f5 100644
--- a/apps/api/app/tasks/lipsync_tts.py
+++ b/apps/api/app/tasks/lipsync_tts.py
@@ -211,8 +211,11 @@ def _estimate_sentence_timings_by_chars(sentences: list[str], total_duration: fl
 @shared_task(
     bind=True,
     name="lipsync_tts.synthesize_and_submit",
-    max_retries=2,
+    max_retries=5,  # 事务竞态重试3次（job not found）+ TTS偶发错误2次
     default_retry_delay=30,
+    autoretry_for=(OSError, ConnectionError),  # 网络/连接错误自动重试
+    retry_backoff=True,
+    retry_backoff_max=30,
     soft_time_limit=180,
     time_limit=200,
 )
@@ -259,7 +262,28 @@ def tts_synthesize_and_submit(
         )
 
         if job is None:
-            logger.error("[lipsync_tts] Job not found: job_id=%s", job_id)
+            # 事务竞态防御：API 在 commit 前投递了任务，worker 消费时事务尚未提交。
+            # Celery 内置 autoretry_for 不支持"业务条件重试"，这里手动 retry 3 次，
+            # 间隔递增（1s/3s/7s），让 API 事务有时间提交。
+            # max_retries 由 self.request(retries) 维护；默认 self.max_retries=3 由装饰器 soft_time_limit 下方指定。
+            retries = getattr(self.request, "retries", 0)
+            max_retries = 3
+            if retries < max_retries:
+                backoff = (2 ** retries) + (retries * 1)  # 1s, 3s, 7s
+                logger.warning(
+                    "[lipsync_tts] Job not found yet (retry %d/%d, backoff %ds): job_id=%s",
+                    retries + 1,
+                    max_retries,
+                    backoff,
+                    job_id,
+                )
+                self.db.close()
+                raise self.retry(countdown=backoff, max_retries=max_retries)
+            logger.error(
+                "[lipsync_tts] Job not found after %d retries, giving up: job_id=%s",
+                max_retries,
+                job_id,
+            )
             return
 
         # 已取消的任务不再处理
diff --git a/tests/unit/test_lipsync_speed_optimization.py b/tests/unit/test_lipsync_speed_optimization.py
index 5963b8a51..13d9e4220 100644
--- a/tests/unit/test_lipsync_speed_optimization.py
+++ b/tests/unit/test_lipsync_speed_optimization.py
@@ -288,3 +288,44 @@ class TestCancelJobTtsProcessing:
 
         result = svc.cancel_job("job-1", "user-1")
         assert result.status == "cancelled"
+
+
+class TestCreateJobCommitOrder:
+    """验证事务顺序修复：create_job 必须先 commit 再发 Celery 任务，避免 worker 消费时 job 不可见。"""
+
+    def test_commit_called_before_apply_async_in_tts_mode(self):
+        """TTS 模式：db.commit() 必须在 apply_async() 之前调用，防止 worker 查不到 job 永远卡在 tts_processing。"""
+        svc, client, cosy = _make_service_with_mocks()
+        call_order: list[str] = []
+
+        def track_commit():
+            call_order.append("commit")
+        def track_apply_async(*args, **kwargs):
+            call_order.append("apply_async")
+
+        svc.db.commit.side_effect = track_commit
+
+        with patch("app.services.lipsync_service.tts_synthesize_and_submit") as mock_task:
+            mock_task.apply_async = MagicMock(side_effect=track_apply_async)
+            svc.create_job(
+                user_id="user-1",
+                video_url="https://example.com/video.mp4",
+                voice_id="v-1",
+                script_text="测试",
+            )
+
+        # 至少有一次 commit 在 apply_async 之前
+        assert "commit" in call_order, "db.commit 必须被调用"
+        assert "apply_async" in call_order, "apply_async 必须被调用"
+        assert call_order.index("commit") < call_order.index("apply_async"), (
+            f"事务顺序错误：commit 必须在 apply_async 之前，实际顺序 {call_order}"
+        )
+
+    def test_job_not_found_retry_mechanism_exists(self):
+        """worker 侧 job not found 必须有重试机制（self.retry），而不是静默 return。"""
+        import inspect
+        from app.tasks.lipsync_tts import tts_synthesize_and_submit
+        source = inspect.getsource(tts_synthesize_and_submit.run)
+        assert "self.retry" in source or "retry" in source, (
+            "tts_synthesize_and_submit 在 job not found 时必须重试，防止静默失败"
+        )