Dustproof microswitch

The dustproof microswitch comprises a dustproof shell, a miniature elastic air bag, a pressing plate and a button, a driving rod is arranged on one side of the bottom of the dustproof shell, the pressing plate is arranged at the top of the pressing rod, a top plate is arranged on the inner wall of the upper half portion of the dustproof shell and located above the pressing plate, and the miniature elastic air bag is arranged at the bottom of the top plate. In the process that the button moves upwards, the limiting plate also ascends along with the button, then the limiting plate drives the pressing rod to move upwards to drive the pressing plate to compress the miniature elastic air bag, and at the moment, air in the miniature elastic air bag is blown out to dissipate heat and cool the interior of the dustproof shell. The movable contact piece drives the button to return to the original position, at the moment, the micro elastic air bag recovers to expand, the air inside the dustproof shell and the air outsid