Plate type high gradient magnetic separator is mainly composed of the bracket, the plate magnetic separation system, the feeding system, the water source system, the unloading iron system, the adjustment system and so on. At work, the material flow and unloading iron system into reverse current type, the use of physical structure of the non magnetic material flow to the mouth of the material, the unloading and flushing to achieve the purpose of complete discharge. Magnetic material by long distance, area, number of times is super strong magnetic adsorption, the railway system reverse operation to iron unloading port, the unloading ore washing to completely unloaded clean.