Automatic sand blasting machine

An automatic sand blasting machine comprises a machine body inside which a sand blasting chamber and a recovery zone are arranged, a sand cylinder used for storing sand, a rotating disc arranged inside the sand blasting chamber, a sand nozzle connected with the sand cylinder through pipelines, and a control unit, wherein, the rotating disc can be loaded with at least one workpiece, after the workpiece is fixed on the rotating disc, the ratating disc is driven to rotate through the control of the control unit; meanwhile, the sand nozzle continuously blasts sand which is led from and connected with the sand cylinder to the workpiece and performs surface cleaning for the workpiece.