Working principle: the powder center will transfer the powder from the hose to the spray gun and be sprayed onto the workpiece by electrostatic spraying in the air. The two - dimensional elevator controls the upper and lower parts of the spray gun to complete the powder spraying more efficiently. 30 to 40% of the powder in the spray chamber is ejected by the spray gun and is adsorbed on the surface of the workpiece surface for surface treatment under the action of static electricity. The remaining 60-70% fall into the lower grooves and are sucked into the wind by the fan and sent back through the hose to the powder center for reuse. A small fraction of the powder is absorbed by the powder recovery equipment and the ordinary powder falls into the powder keg and uses it to complete the secondary recovery. Tiny particles can be expelled in the wind.