The mica heater uses Ni80Cr20 alloy heating wire as the heating element, insulated with mica soft board as the thermal conductive medium, and wrapped with stainless steel plate (SUS304) or galvanized steel sheet thin metal plate. The mica heater has high insulation and fire-resistant mica wrapped around electric heating wires. The two ends of the electric heating wire core have good insulation and fire-resistant layers, which are first made into flat plates and then mechanically twisted into shapes. Mica heating coils have the characteristics of reasonable structure, beautiful appearance, stable performance, uniform heating, fast heat dissipation, long service life, good insulation performance, and high voltage resistance.