The enamel coating on the surface of steel plate can prevent the steel plate from rusting, so that the steel plate can not form an oxide layer on the surface when heated and can resist the corrosion of various liquids. Enamel products are not only safe and non-toxic, easy to wash enamel steel plate clean, but also under certain conditions, enamel enamel on the metal body shows high hardness, high temperature resistance, wear resistance and insulation and other good properties.