The temperature protection displays the real-time measured data. In case of failure, it has the function of on-off signal output and execution warning; in case of failure, it has the function of on-off signal output and execution protection; in case of failure, the failure of high-voltage power supply acts on the main circuit breaker of high-voltage power supply. In case of fault, the breaker will cut off the main circuit, and the fault signal will be sent back to the control unit through the switch value of signal relay. The overtemperature sprinkler water temperature sensor is set to drive the drum surface temperature, compare the unit judgment, give the corresponding signal to the solenoid valve, control the opening and closing of the solenoid valve, and achieve the overtemperature sprinkler effect.