The invention relates to the technical field of screw heaters, and discloses a screw heater with an overheating protection function, which comprises a screw heater, the surface of the screw heater is fixedly connected with a fixed bracket, the bottom of the fixed bracket is fixedly connected with a support plate, and the screw heater also comprises a heat dissipation part, and the heat dissipation part comprises a connecting
pipe, the end of the connecting
pipe communicates with the end of the screw heater, and the end, away from the screw heater, of the connecting
pipe communicates with a heat dissipation frame. According to the screw heater, plastic is heated, when the temperature in the screw heater is too high, the heat dissipation component is started to start working,
airflow generated by the heat dissipation component enters the screw heater and cools the screw heater, the
airflow entering the screw heater is exhausted through the exhaust component, and the heat dissipation effect is improved. And the heat dissipation component can push the exhaust component to rotate during rotation, and the exhaust component can collect high-temperature
airflow in the screw heater and exhaust the high-temperature airflow out of the outer end of the screw heater during operation.