Enamelled wire is coated with one or more insulating coatings on the surface of the conductor, which is baked and cooled to form a kind of wire with insulating layer. Enamelled wire is a kind of electromagnetic wire (winding wire), which is used for electromagnetic induction. Compared with round wire, rectangular wire has incomparable advantages and characteristics and is used in many fields. The product has superior thermal resistance, chemical solvent resistance and thermal shock resistance.