The machine is composed of feeding port, discharging port, hollow shaft, bearing, (bearing bush), cylinder, big gear, small gear, reducer, motor, etc. The grinding process is to load the material into a continuous rotating cylinder, which is filled with a certain number of different size grinding bodies, such as ball, rod, short cylinder, etc. when the cylinder rotates at a certain speed, these grinding bodies are driven to produce impact and grinding effect, so as to grind the material.