Automatic paint spraying device

The utility model relates to an automatic paint spraying device. The automatic paint spraying device comprises a turntable, a positioning mandrel, a driving motor, an automatic spray gun and a control unit, wherein the turntable comprises a chassis and a boss coaxially connected with one side of the chassis, the diameter of the chassis is equal to the outer diameter of the brake drum, the diameter of the boss is equal to the inner diameter of the brake drum, the brake drum is placed on the chassis, and the boss can be used for limiting movement of the brake drum; the driving motor drives a positioning mandrel coaxially connected with the side, away from the boss, of the chassis through a conveying belt, and the positioning mandrel can drive the chassis to rotate around the center axis of the chassis at a constant speed; the spraying direction of the automatic spraying gun position faces the brake drum reinforcing band, the control unit can control the spraying time needed by the automatic spraying gun to be m