An outdoor electric power cabinet disclosed by the present invention comprises a cabinet body, a rainproof cover, a filtering device and a slag discharging groove, the rainproof cover is fixed at two corresponding sides of the top of the surface of the cabinet body, and the filtering device is fixed between the top of the surface of the cabinet body and the two corresponding sides of the inner wall of the rainproof cover. The slag discharging groove is formed in the surface of the cabinet body and is located at the bottom of the filtering device, an air inlet is formed in the surface of the cabinet body and is located at the position of the filtering device, a heat dissipation mechanism is fixed to the top of the inner wall of the cabinet body and is located at the position of the air inlet, and a magnetic block is fixed to the back face of a fan blade of the heat dissipation mechanism. The invention relates to the technical field of power devices. According to the outdoor electric power cabinet, the purposes of filtering and self-cleaning are achieved, dust and sundries can be timely filtered and self-cleaned, adhesion to the surface of a filter screen is reduced, blockage can be effectively prevented, the filtering effect is good, meanwhile, heat dissipation is facilitated, the service life of components is prolonged, and the use performance is improved.