The utility model provides a constant-temperature electrical cabinet capable of controlling the temperature of an outdoor accumulator to be balanced. The constant-temperature electrical cabinet is characterized by comprising a cabinet body with an insulating layer, wherein a slope type rain covering top cover is fixed at the top of the cabinet body with the insulating layer; air outlets are formed in the periphery of the top, which is in contact with the slope type rain covering top cover, of the cabinet body with the insulating layer; an exhaust fan and a temperature monitoring device are fixedly connected with the inner top of the cabinet body with the insulating layer; an air inlet induced draft fan and a heating device are fixedly connected with the inner bottom of the of the cabinet body with the insulating layer; a plurality of accumulator partition boards with air vents are arranged in the cabinet body with the insulating layer in the height direction at intervals. The constant-temperature electrical cabinet provided by the utility model has the advantages as follows: rain prevention is achieved, the heat preservation effect is good, the temperature control is accurate, and temperature distribution in the electrical cabinet is uniform.