The invention discloses a microswitch with a heat dissipation structure. The microswitch comprises a bottom shell and a face cover, a wire inlet terminal, a wire outlet terminal and a button are arranged on the bottom shell, a connecting feeler lever is arranged inside the bottom shell, a resetting spring is arranged between the button and the inner wall of the bottom shell, clamps are arranged onthe inner wall of the bottom shell, a heat dissipation air-guiding pipe is arranged inside the bottom shell and fixed to the inner wall of the bottom shell through the clamps, a cavity with an opening in the side face is formed in the bottom shell, a bearing plate is arranged inside the cavity, a resetting tension spring is fixed between the end of the bearing plate and the end wall of the cavity, a round hole is formed in the side wall of the bottom shell, air outlet holes are evenly formed in the heat dissipation air-guiding pipe, a heat dissipation window is formed in the side wall of thebottom shell, and a small heat dissipation air blower is further arranged. The microswitch is reasonable in structural arrangement, the overall heat dissipation performance of the microswitch is greatly improved, arc extinguishing of the microswitch is easy, using stability is improved, the service life is prolonged, the application range is enlarged, and practicability is good.