The utility model provides an electrical control cabinet comprising a cabinet body and a cabinet door. The cabinet door and the cabinet body are in rotation connection through a hinge; the cabinet body is a cuboid; the horizontal top board and bottom plate inside the cabinet body are equipped with an LED illuminating lamp and a heating dehumidifying device respectively; a vertical electrical installation board is arranged between the top board and bottom plate; the electrical installation board is vertically equipped with a communication device, a PLC control device, an intermediate relay, an air switch, a phoenix terminal, an isolation transformer and a UPS power supply in sequence, wherein the isolation transformer, the UPS power supply, the air switch, the PLC control device and the communication control device are connected in sequence; the intermediate relay is connected with the PLC control device; and the LED illuminating lamp and the heating dehumidifying device are connected with the air switch. The electrical control cabinet can automatically control the connection and disconnection of each high-voltage circuit breaker and a contactor in the low-voltage ride through detection test process of a photovoltaic power station.