The materials convey into belt by vibrating feeder with uniformly layering, when materials pass through the strength magnetic roller, the magnetic particles are adsorbed to the strength magnetic roller due to the magnetic force, with rotation of the belt, the magnetic particles break away from magnetic filed and fall into mags collect hopper, nonmagnetic materials are discharged over the roller in a normal trajectory., then fall into non-mags collect hopper, the working principle shown as figure 2. The equipment can be configured into a multi-layer separation structure, the principle is the same as above.