Heat dissipation structure and PLC housing

The utility model provides a heat dissipation structure and a PLC housing, and relates to the technical field, the heat dissipation structure comprises a cabinet body, two sides of the front end of the cabinet body are provided with door plates, a cavity of the cabinet body is internally provided with a dustproof assembly, and the top end of the cabinet body is connected with a heat dissipation assembly; the heat dissipation assembly comprises a fixing disc, a fan, a handle and sliding blocks, the top end of the cabinet body is connected with the fixing disc, the fan is arranged in the middle of the fixing disc, the handle is arranged on the upper rear portion of the fixing disc, and the two sides of the bottom end of the fixing disc are connected with the sliding blocks; an inner plate is arranged at the front end of the heat dissipation assembly; a cleaning assembly is arranged at the front end of the heat dissipation assembly, a heat dissipation plate is connected to the rear end of the cabinet body, the h