In the process of working, the high performance magnetic magnetic separator of hematite is used as a magnetic source. In the working process, the material is separated in the magnetic field of the roller surface, with the aid of magnetic force and mechanical force on the particles. When the material is selected, the magnetic particles are different from the non magnetic particles when the magnetic field is different, that is, the difference is produced by the magnetic particles and the non magnetic particles. The magnetic particles are adsorbed on the surface of the cylinder and fall into the 2 magnetic zone with the roller to the non magnetic zone. After two screening, the magnetic particles are discharged from the magnetic material hopper, and the non magnetic particles are thrown forward by the centrifugal force and are excluded from the nonmagnetic material hopper.