At present, there are three kinds of spraying methods for automobiles interior surface, including artificial air spray gun spraying, artificial electrostatic (air) spray gun spraying and robot rotary cup spraying. When the traditional air spray gun is used to spray the inner surface of the car body, the paint transfer efficiency is only 25% ~ 35%. Only a small amount of atomized paint is attached to the car body surface, and most of the rest becomes over spray mist, which is pressed into the paint mist capture system by the air supply and exhaust system and becomes paint slag, causing great waste and VOC emission, Moreover, a large number of chemicals (such as coagulant and flocculant) are needed to deal with the paint mist, and the paint residue formed needs to be treated at a cost, which also has a great impact on the environment.