Fluid cyclone is a common separation and classification equipment, and the principle of centrifugal sedimentation is commonly used. When the two-phase mixed liquid to be separated enters the cyclone tangentially from the periphery of the cyclone at a certain pressure, a strong three-dimensional elliptical strong rotational shear turbulent motion is generated. Due to the difference in particle size between coarse particles and fine particles, the centrifugal force, centripetal buoyancy, fluid drag force, etc. are different in size. Due to centrifugal sedimentation, most of the coarse particles are discharged through the bottom flow outlet of the cyclone, while most of the fine particles are discharged from the bottom of the cyclone. The overflow pipe is discharged, so as to achieve the purpose of separation and classification.