Signal transmitter with stable heat dissipation

The utility model discloses a signal transmitter with stable heat dissipation, comprising a signal transmitter, one side of the signal transmitter is provided with a heat dissipation port, the inner side wall of the heat dissipation port is provided with a heat dissipation net plate, one side of the heat dissipation net plate located in the signal transmitter is provided with a heat dissipation device, and the other side of the heat dissipation net plate is provided with a cleaning device. A cleaning brush is driven to rotate on one side of a heat dissipation net plate under the action of a groove formed in the surface of a limiting block and the surface of a rotating rod by a movable sleeve, so that the movable sleeve drives the limiting block to move in a direction far away from the heat dissipation net plate in the groove under the action of the heat dissipation net plate; the cleaning brush can be close to the heat dissipation screen plate again through the movable sleeve under the action of the spring, a