diff --git a/gateway/platforms/qqbot/adapter.py b/gateway/platforms/qqbot/adapter.py
index 0260ac93791b..42a7bc650e35 100644
--- a/gateway/platforms/qqbot/adapter.py
+++ b/gateway/platforms/qqbot/adapter.py
@@ -1936,15 +1936,15 @@ class QQAdapter(BasePlatformAdapter):
                     )
                     return None
 
-            # 4. Call STT API
+            # 4. Call STT API and always clean up the temp WAV afterward.
             logger.debug("[%s] STT: calling ASR on %s", self._log_tag, wav_path)
-            transcript = await self._call_stt(wav_path)
-
-            # 5. Cleanup temp file
             try:
-                os.unlink(wav_path)
-            except OSError:
-                pass
+                transcript = await self._call_stt(wav_path)
+            finally:
+                try:
+                    os.unlink(wav_path)
+                except OSError:
+                    pass
 
             if transcript:
                 logger.debug("[%s] STT success: %r", self._log_tag, transcript[:100])
diff --git a/tests/gateway/test_qqbot.py b/tests/gateway/test_qqbot.py
index 10d558c82602..349b2a0ed799 100644
--- a/tests/gateway/test_qqbot.py
+++ b/tests/gateway/test_qqbot.py
@@ -5,6 +5,7 @@ import os
 from types import SimpleNamespace
 from unittest import mock
 
+import httpx
 import pytest
 
 from gateway.config import PlatformConfig
@@ -215,6 +216,73 @@ class TestVoiceAttachmentSSRFProtection:
         assert connected_explicit is False
 
 
+# ---------------------------------------------------------------------------
+# Voice attachment temp-file cleanup
+# ---------------------------------------------------------------------------
+
+class TestVoiceAttachmentTempCleanup:
+    def _make_adapter(self, **extra):
+        from gateway.platforms.qqbot import QQAdapter
+        return QQAdapter(_make_config(**extra))
+
+    def _setup_download_mocks(self, adapter, content=b"RIFFmock-wav-audio-data"):
+        response = mock.Mock()
+        response.content = content
+        response.headers = {"content-type": "audio/wav"}
+        response.raise_for_status = mock.Mock()
+
+        adapter._http_client = mock.AsyncMock()
+        adapter._http_client.get = mock.AsyncMock(return_value=response)
+
+    def test_temp_wav_cleaned_up_on_stt_failure(self):
+        adapter = self._make_adapter(app_id="a", client_secret="b")
+        self._setup_download_mocks(adapter)
+        seen = {}
+
+        async def _raise_transport_error(path):
+            seen["wav_path"] = path
+            raise httpx.TransportError("boom")
+
+        with mock.patch("tools.url_safety.is_safe_url", return_value=True):
+            adapter._call_stt = mock.AsyncMock(side_effect=_raise_transport_error)
+            transcript = asyncio.run(
+                adapter._stt_voice_attachment(
+                    "https://cdn.qq.com/voice.silk",
+                    "audio/silk",
+                    "voice.silk",
+                    voice_wav_url="https://cdn.qq.com/voice.wav",
+                )
+            )
+
+        assert transcript is None
+        assert "wav_path" in seen
+        assert not os.path.exists(seen["wav_path"])
+
+    def test_temp_wav_cleaned_up_on_stt_success(self):
+        adapter = self._make_adapter(app_id="a", client_secret="b")
+        self._setup_download_mocks(adapter)
+        seen = {}
+
+        async def _return_transcript(path):
+            seen["wav_path"] = path
+            return "hello from qq voice"
+
+        with mock.patch("tools.url_safety.is_safe_url", return_value=True):
+            adapter._call_stt = mock.AsyncMock(side_effect=_return_transcript)
+            transcript = asyncio.run(
+                adapter._stt_voice_attachment(
+                    "https://cdn.qq.com/voice.silk",
+                    "audio/silk",
+                    "voice.silk",
+                    voice_wav_url="https://cdn.qq.com/voice.wav",
+                )
+            )
+
+        assert transcript == "hello from qq voice"
+        assert "wav_path" in seen
+        assert not os.path.exists(seen["wav_path"])
+
+
 # ---------------------------------------------------------------------------
 # WebSocket proxy handling
 # ---------------------------------------------------------------------------