This machine is a horizontal drum-like rotary unit, its outside is driven along the gear, inside the drum is medium (steel ball), material is fed through the feeding end of the drum, by following the rotation of the drum, the medium falls down after being lifted to a certain height by the centrifugal force from drum movement, heavily bang on the material due to irregular slide and rolling. Grinding thus comes into being among the medium, material and drum, so as to grind the material. The material is continuously fed, dynamic granularity level difference is thus occurred between the feeding and discharging ends, fine material flows out of the drum slowly and gradually grinding.