diff --git a/internal/service/device/binding.go b/internal/service/device/binding.go
index 6b1eb21..c9ea4ac 100644
--- a/internal/service/device/binding.go
+++ b/internal/service/device/binding.go
@@ -421,6 +421,24 @@ func (s *Service) UnbindCard(ctx context.Context, deviceID uint, cardID uint) (*
 		return nil, err
 	}
 
+	var cardAudit map[string]any
+	if card, cardErr := s.iotCardStore.GetByID(ctx, binding.IotCardID); cardErr == nil {
+		cardAudit = map[string]any{
+			"id":     card.ID,
+			"iccid":  card.ICCID,
+			"status": card.Status,
+		}
+	}
+
+	beforeAuditData := map[string]any{
+		"device":      deviceSnapshot(device),
+		"binding_id":  binding.ID,
+		"iot_card_id": binding.IotCardID,
+	}
+	if cardAudit != nil {
+		beforeAuditData["card"] = cardAudit
+	}
+
 	if err := s.deviceSimBindingStore.Unbind(ctx, binding.ID); err != nil {
 		s.logDeviceOperation(
 			ctx,
@@ -428,11 +446,7 @@ func (s *Service) UnbindCard(ctx context.Context, deviceID uint, cardID uint) (*
 			"设备解绑卡失败",
 			constants.AssetAuditResultFailed,
 			device,
-			map[string]any{
-				"device":      deviceSnapshot(device),
-				"binding_id":  binding.ID,
-				"iot_card_id": binding.IotCardID,
-			},
+			beforeAuditData,
 			nil,
 			0,
 			0,
@@ -451,21 +465,22 @@ func (s *Service) UnbindCard(ctx context.Context, deviceID uint, cardID uint) (*
 		)
 	}
 
+	afterAuditData := map[string]any{
+		"iot_card_id": cardID,
+		"unbind":      true,
+	}
+	if cardAudit != nil {
+		afterAuditData["card"] = cardAudit
+	}
+
 	s.logDeviceOperation(
 		ctx,
 		constants.AssetAuditOpDeviceUnbindCard,
 		"设备解绑卡",
 		constants.AssetAuditResultSuccess,
 		device,
-		map[string]any{
-			"device":      deviceSnapshot(device),
-			"binding_id":  binding.ID,
-			"iot_card_id": binding.IotCardID,
-		},
-		map[string]any{
-			"iot_card_id": cardID,
-			"unbind":      true,
-		},
+		beforeAuditData,
+		afterAuditData,
 		1,
 		1,
 		0,