▎ 摘　　要

NOVELTY - The device has a well opening room fixed at a mine well head and provided with a vehicle inlet and a vehicle outlet that are connected by a sliding rail, where the vehicle inlet is provided with a vehicle inlet sensing door. The vehicle outlet is provided with a vehicle outlet sensing door. The well opening room is provided with a graphene heater, a temperature sensor and a controller, where the temperature sensor is connected with the controller. The controller controls the graphene heater according to a temperature signal output by the temperature sensor. USE - Mine well head protecting device. ADVANTAGE - The controller can control a working state of the graphene heater according to the temperature signal output by the temperature sensor and maintain temperature in the well opening room above 2 degrees centigrade so as to ensure smooth and safe production of a coal mine. DESCRIPTION OF DRAWING(S) - The drawing shows a top view of a mine well head protecting device.