An electric furnace that uses the induction electrothermal effect of the warehouse to heat or melt the warehouse. There are three types of AC power used in induction furnaces: power frequency (50 or 60 Hz), intermediate frequency (150~10000 Hz) and high frequency (10000 Hz). The main components of the induction furnace are the inductor, the furnace body, the power supply, the capacitor and the control system. Under the action of the alternating electromagnetic field in the induction furnace, eddy currents are generated inside the material, thereby achieving the effects of heating or ignition. Induction furnaces typically switch on the induction heating furnace and the melting furnace. Melting furnaces are divided into core induction furnaces and coreless induction furnaces. The cored induction furnace is mainly used for smelting and heat preservation of various cast iron and other metals. It can use waste furnace materials and has low smelting cost. Induction furnaces are divided into power frequency induction furnaces, triple frequency induction furnaces, generator set intermediate frequency induction furnaces, thyristor intermediate frequency induction furnaces, and high frequency induction furnaces.