The present invention discloses a heat dissipation structure of the tire repair machine, wherein, a positioning pedestal having at least one channel is provided inside the body, a channel inlet and a channel outlet are provided at the two ends of the channel respectively; a gas supply unit arranged inside the body comprises a motor and an air compressor driven by the motor, the motor is arranged at the rear of the positioning pedestal, such that the radial direction of a centrifugal fan connected with the drive shaft of the motor is directed to the channel inlet, while the air compressor is corresponding to the channel outlet; when the motor drives the air compressor to run, the air drawn in by the centrifugal fan can blow the air compressor via the channel, so as to perform heat dissipation for the air compressor.