In the main frame of high pressure suspension mill, there is a high pressure spring about 1000-1500kg around the roller hanger. When working, the roller is rotating around the main shaft and rolling against the ring closely, with the force of high pressure spring and centrifugal force, whose rolling force is 2 times higher than R mill, so the capacity has improved a lot. After the materials are sent into the grinding room, the shovel is scooping them and putting them to the room between the roller and the ring, and the grinded powder is brought to powder separator by circulating air from the blower, with the qualified powder brought to the powder concentrator as final products and coarse ones to the grinding room. Circulation air repeats the above process, and the extra air is purified by bag filter and then discharged. When the roller and the ring are wore, adjusting the length of high pressure to keep the stable grinding pressure so as to ensure the capacity and fineness.