Powder coating is a surface treatment method for spraying plastic powder on parts. Spraying, that is, we often speak of electrostatic powder spraying coating, and its processing technology since 1980s, the international use of a more common metal surface treatment of decorative technology. Compared with the surface treatment of ordinary spray paint, the technology has the advantages of advanced technology, energy saving, high efficiency, safety and bright color. Therefore, it is often applied in the light industry and home decoration fields. The working principle is that the plastic powder by high voltage electrostatic charging equipment, under the action of electric field, the coating is sprayed onto the surface of the workpiece, powder can be uniformly adsorbed on the surface of the workpiece, forming a powdery coating; and powder coatings after high temperature baking after leveling curing, plastic particles will melt into the final coating protection effect is different the dense layer firmly attached to the surface of the workpiece.