Rivet gun

A riveting gun comprises a shell, a motor located in the shell, a transmission mechanism connected to the motor and a screw driven by the transmission mechanism, and the motor drives the screw to move through the transmission mechanism. The riveting gun comprises two Hall elements located in a shell, a controller and a current sensor, the maximum specification of a rivet drawn by the riveting gun is limited by the two Hall elements, the controller is provided with a preset current value for starting a motor to rotate reversely, and the current sensor is used for detecting the current value in a working circuit. When the specification of a rivet drawn by the riveting gun is smaller than the maximum specification, the motor rotates forwards to drive the screw to draw the rivet until the rivet is snapped, the current sensor detects that the current value in the working circuit is attenuated to a preset current value, and at the moment, the controller controls the motor to rotate backwards to reset the screw. By