Introduction: graphene electric heating film is a self-developed core heating slurry, which has a good controllable positive temperature coefficient (PTC) to ensure stable performance without attenuation. The electrothermal film substrate is made of high-quality pet substrate certified by the European Union, which can withstand voltage above 3750V. The protective layer material is made of PVC certified by the European Union (RoHS). The distributed capacitive current absorption layer is made of low resistance material and independent insulation composite material, equipped with leakage protection switch.