The rotary type magnetic separator is composed of a ring-shaped magnetic grid, a stainless steel case and a geared motor. The rotary type magnetic separator drives the ring-shaped magnetic grid to rotate by the gear motor, thereby effectively preventing the material from bridging when flowing through the rotatory magnetic separator. Blockage and the like occur to efficiently remove iron impurities in the loose agglomerated material. Rotary type magnetic separator is mainly used for sorting fine iron impurities in powder materials with relatively poor fluidity and easy to accumulate. These materials are more likely to be blocked or piled up by using traditional magnetic grid or drawer type magnetic separator. Widely used in food, food additives, pharmaceuticals, fine chemicals, lithium battery positive and negative materials, pigments, carbon black, flame retardants and other industrial production lines.