A group of leaves consists of 8 leaves. The weight difference of each blade in each group of blades is controlled within 2G, which can ensure that each group of blades does not produce overweight phenomenon, and effectively reduces vibration and noise. Since the blade of the shot blasting device is inserted from the center of the impeller, the blade is fixed by the centrifugal force during the impeller rotation, so no clamping tool is needed. When removing the blade, the blade can be easily removed by tapping the outer end of the blade. It takes only 5-10 minutes to remove the 8 blades, and the wear of the shot wheel and orientation sleeve can be checked at the same time.