Flow switch

The utility model discloses a flow switch, which belongs to the technical field of flow detection devices and comprises a flow switch body and a buffer portion. A mounting rod and a probe connected with the mounting rod are arranged on one side of the flow switch body; when flow detection is carried out, the flow switch body is arranged on the outer side of a to-be-detected pipeline, the mounting rod can penetrate through the to-be-detected pipeline and is detachably connected with the to-be-detected pipeline, and the probe can stretch into the pipeline to measure the flow in the pipeline. The buffer part comprises a stirring piece and a driving piece which is connected with the stirring piece to drive the stirring piece to rotate, the stirring piece is arranged opposite to the probe and can rotate around the probe in the circumferential direction, and the side, close to the probe, of the stirring piece is attached to the probe and forms a cleaning end which is used for sweeping sundries on the probe when rot