Cryogenic milling machine uses liquid nitrogen as cooling medium, and the material is embrittled at a low temperature by cooling. After being easily pulverized, it enters the pulverizer chamber, and the high-speed rotation of the impeller causes repeated collisions between the material and the blade, the ring gear, and the material and the material. Under the combined action of collision, shearing and friction, the crushing effect is achieved. The inner chamber don't have screen mesh, the fineness of crushing is adjustable, and liquid nitrogen is recycled. The main features of this machine, large output, high fineness, up to 1000mesh.