Computer host provided with dustproof structure and facilitating heat dissipation

The computer host comprises a machine shell and a transmission case, the transmission case is fixedly connected to the left side of the top of the machine shell, and an electric telescopic rod is movably installed on the left side of the inner wall of the transmission case. Through the arrangement of the time relay, the time relay starts the electric telescopic rod at regular time to drive the timing dustproof mechanism to perform timing cleaning and dust prevention on the top of the machine shell, and meanwhile, the transmission induction assembly is started to drive the refrigeration fan through the chain to perform heat dissipation on the interior of the machine shell; the problems that after an existing computer is used for a certain period of time, a host is heated, heat dissipation is not convenient, more and more dust is accumulated on the top of the host due to the fact that the top of the host is not provided with a dustproof structure, and if dust is cleaned irregularly, the dust permeates into the