A high-efficiency and environment-friendly paint spraying device for workpieces, comprising a main body, a mixing bucket is arranged inside the main body, a stirring shaft is vertically arranged on the mixing bucket, a driving shaft is fixedly installed on the motor shaft of a driving motor, and a coaxial fixed installation is installed at the bottom end of the driving shaft. The worm, the worm is located inside the body, the body is equipped with a worm wheel, the bottom of the worm is fixedly installed with a turntable, the bottom of the body is equipped with a horizontal rod, the horizontal rod is covered with a sleeve, the top of the sleeve is fixedly installed with a nozzle, and the sleeve is hinged. The first connecting rod, the second connecting rod is hinged on the first connecting rod, the stirring blade stirs and mixes the paint, avoids the accumulation and condensation of the paint, and facilitates the spraying of the paint from the nozzle, and the nozzle reciprocates along the horizontal bar to spray paint on the workpiece , the workpiece can rotate with the turntable, the workpiece can be sprayed with paint in all directions, the spraying is uniform, and the painting efficiency is high; the fan transports the dispersed paint inside the main body to the air purification box for purification treatment, which is more environmentally friendly.