The present invention discloses a power distribution cabinet with functions of heat dissipation and dust removal. A heat dissipation port is arranged on the cabinet body, and the heat dissipation port is composed of a plurality of parallel strip-type heat dissipation holes or a plurality of uniformly-distributed hole-type heat dissipation holes. An exhaust fan is arranged in the cabinet body corresponding to the heat dissipation port. In the cabinet, four air ejector pipes are evenly fixed on the periphery of the exhaust fan and are communicated with the help of an air duct. The air duct communicates with an air pump. The air duct still communicates with a spring pressure boost airbag. The air duct is provided with an electromagnetic switch valve behind the spring pressure boost airbag. The electromagnetic switch valve, the air pump and the exhaust fan electrically connect in series and are connected with a power supply loop of the power distribution cabinet through a dust removal switch. Compared to the prior art, the power distribution cabinet has the better functions of heat dissipation and dust removal.