Three layer insulated winding widely used computer, mobile phone, camera, TV sets, printers and other high-frequency transformer parts. The use of the product coils without coil level adding insulating layer and shielding belt, can reduce the volume of the transformer transformer, reduce weight, simplify and improve production efficiency, reduce production costs, three layer insulated winding transformer is to realize miniaturization, high efficiency of newmaterials. By 20 W transformer as an example, it can reduce the volume of 1/2,reduce the weight of 1/3.