In the main machine of high-pressure suspension roller mill, a high-pressure spring with a pressure of 1000-1500kg is fastened on the grinding roller hanger. After working, the grinding roller rotates around the main shaft and rolls close to the grinding ring under the action of high-pressure spring and centrifugal force. Its rolling pressure is 1.2 times higher than that of Raymond powder machine under the same power conditions, so the output is greatly improved. When the ground material enters the grinding chamber, it is scooped up by the shovel and sent between the grinding roller and the grinding ring for rolling. The rolled powder is brought into the analyzer with the circulating air of the blower. The qualified fine powder flows into the cyclone powder collector with the gas, which is the finished product, and the large particles fall back to regrinding. The circulating air returns to the blower and repeats the above process, and the remaining air enters the bag filter for purification. When the grinding roller and the grinding ring reach certain wear, the length of the high pressure spring is adjusted to maintain the constant rolling pressure between the grinding roller and the grinding ring. So as to ensure stable yield and fineness.