Heating device of medium-frequency induction furnace for well lid

The utility model relates to the technical field of electric induction furnaces, and provides a heating device of a medium-frequency electric induction furnace for a well lid, which comprises a working box, a lifting plate is nested in the working box, the top of the lifting plate is fixedly connected with a boiler through screws, and a heat insulation lining plate is fixedly sleeved on the peripheral surface of the boiler. A plurality of induction coils are fixedly connected to the heat insulation lining plate through screws, a servo motor is installed on the top of the working box, the output end of the servo motor is connected with a coaxially-arranged lifting screw rod through a coupler, and through arrangement of the lifting screw rod, a cabin opening screw rod and other structures, when the servo motor is started, the cabin opening screw rod is started; when the lifting plate is pulled up, the first cabin door and the second cabin door synchronously retreat into the working box, when the cabin doors ret