The powder coating is a solid powdery synthetic resin coating composed of a solid resin and a pigment, a filler, and an auxiliary agent. Unlike common solvent-based coatings and water-based coatings, its dispersion medium is not solvent and water, but air. It has solvent-free pollution, 100% film formation and low energy consumption. Powder coatings are available in both thermoplastic and thermoset types.