The invention relates to a sand blasting machine. The sand blasting machine comprises a case provided with a working cavity; the working cavity is internally provided with a lower roller, an upper roller, a bearing belt wound around the lower roller and the upper roller, shaping wheels arranged between the upper roller and the lower roller, and a first power assembly driving the upper roller to rotate, wherein at least two shaping wheels are arranged and are close to the two sides of the bearing belt correspondingly; the surface of the outer side of the bearing belt is wound around the circumferential surfaces of the shaping wheels, and a storage zone for storing workpieces is formed; the surface of the bearing belt is provided with a plurality of discharging holes for allowing sand to pass in a hollowed-out mode; and a sand blasting mechanism of which a blasting head faces towards the storage zone is arranged above the storage zone. The sand blasting machine has the characteristics that limitation to shapes of the workpieces is eliminated, batch sand blasting is conducted on all surfaces of the workpieces, and in addition, the high sand blasting quality and high covering uniformity are achieved.