The utility model relates to a coal mining appurtenance, concretely relates to automatic cash device that moves of tail, the device include that scavenging valve, high compressed steel compile pipe, cylinder, fixing device and push away the cash ware be equipped with fixing device on the cylinder body of cylinder, fix the cylinder through this fixing device on the tail, be equipped with high compressed steel volume pipe on the cylinder on compiling and manage, high compressed steel is equipped with the scavenging valve the tailpiece of the piston rod portion of cylinder is equipped with and pushes away the cash ware, through the adjustment high compressed steel is compiled on the pipe the scavenging valve is controlled stretching out and drawing back of cylinder, and drive piston rod and push away the cash ware and pass coal gangue. The utility model discloses a pass coal gangue when the coal is cut in the belt conveyor operation, improved work efficiency, eliminated corresponding potential safety hazard.