The electromagnetic wire wrapping wire is made of polyester polyester as wrapping material. The biggest feature of polyester silk covered wire is its direct weldability. There is no need for sand head in use, and it can be directly welded, which avoids the virtual welding caused by uneven sand head and improves the welding quality. Its insulation performance, high frequency performance, heat resistance, etc. are higher than those of natural silk covered wire. The product has been tested many times, and its Q value and inductance value L are higher than or equal to the same type of imported polyester silk covered wire. Polyester silk is a chemical fiber product, it is rich in resources, and its price is 70% lower than that of natural silk. Polyester silk covered wire is a promising electromagnetic wire product.