mill uses horizontal sleeve revolving device, working with a gear wheel in the outside, two warehouses, grille-type ball mill. Material was spirally put in the first warehouse of mill through the hollow shaft by the input device, the warehouse has ladder-type and moire liner, and many different steel balls, they drop after they are lift by the centrifugal force. After materials were roughly ground in the first warehouse, will be ground in the second warehouse, and finish the expected effect.