Sandblasting machine is a kind of machine that uses compressed air as power to form a high-speed jet beam which sprays the abrasives into the surface of the workpiece to be treated at high speed. Because of the impact and cutting action of abrasives on the workpiece surface, the workpiece surface is cleaned up to a certain extent and has different roughness, so the mechanical properties and fatigue resistance of the workpiece surface are improved, and the adhesion between the workpiece and the coating is increased, the durability of the coating is prolonged, and it is also conducive to the leveling and decoration of the coating.