Metal shredders are mostly applied in processing scrap automobile body, old home appliances, bicycles and other inferior wastes to transform them into high-quality steel-making raw materials. Through the continuous shredding, the coating films are removed and the bulk specific gravity is increased. When the materials are put into the electric furnace, blasting can be avoided. Under certain states, the melting rate can be promoted so as to satisfy the requirement on “putting fine materials into the furnace” put forward by the steel factory. The equipment has some advantages, mainly including high production capacity, low energy consumption, high efficiency, fine and well-distributed output, etc. Moreover, when using the equipment, it demonstrates multiple advantages, including low noise, no pollution, easy operations and convenient maintenance.