The invention discloses a power distribution cabinet, which comprises a cabinet body with an opening in the front end and a cabinet door connected to the front end of the cabinet body through hinges; a slope plate which is high in the middle part and low in two sides is formed at the bottom part in the cabinet body; a stepper motor is arranged at the lower part of a rear cabinet plate at the rear side of the cabinet body above the middle position of the slope plate in the cabinet body; an output shaft of the stepper motor is connected with a refrigeration piece assembly which is horizontally arranged along the frontward-backward direction of the cabinet body; a front baffle plate is arranged at the lower part of the front side of the cabinet body; a first flow guide plate is fixedly connected to the left upper part of the refrigeration piece assembly in the cabinet body; a baffle plate is fixedly connected to the right side of the refrigeration piece assembly in the cabinet body; an upper air inlet is formed, between the first flow guide plate and a second flow guide plate, in the left side of the cabinet body; an upper fan is arranged in the upper air inlet; the outer wall on the left side of the cabinet body is connected with an upper air inlet plate above the upper air inlet; and exhaust openings are formed in the left side and the right side of the upper part of the cabinet body. The power distribution cabinet is simple and compact in structure and suitable for use in various complicated working environments.