Automatic constant-temperature instrument cabinet

The invention relates to the technical field of power distribution equipment, in particular to an automatic constant-temperature instrument cabinet. The cabinet comprises a cabinet body, wherein a thermal insulation layer is fixedly connected to the inner wall of the cabinet body, multiple groups of ventilation ports are equidistantly formed in two opposite side walls of the cabinet body, coolingfins are rotationally connected into the ventilation ports, one end of each of the cooling fins at the two sides of the cabinet body is connected with a group of stretching mechanisms, an electric heating pipe is arranged on the surface of the inner wall of the cabinet body, a cooling fan is further arranged inside the cabinet body, a temperature sensor is furthermore arranged inside the cabinet body, the temperature sensor is connected with a processor, the processor is fixedly connected to the surface of the inner side wall of the top of the cabinet body, a buzzer alarm is fixedly connectedto the top end of the cabi