Ball milling machine is the cylindrical swiveling mechanism. It is the outside gearing, double-hopper and lattice ball milling machine. The materials are transferred into the first hopper of the ball milling machine by quill shaft screw of the feeding equipment. This first hopper has the stepped lining board or corrugated liner board, and the steel balls with different specifications. When the cylinder rotates, centrifugal force will come into being and lift the steel ball to a certain height. Then, the steel balls will fall down, and have strike and grinding impact on the materials. After kibbling in the first hopper, the materials will be transported into the second hopper by single-wall partition. The second hopper has the steel balls inside the scaleboard which will make further grinding to the materials. The powder will be pulled out by the discharging grate plate and accomplish the grinding.