Mixed scrap metal raw materials are conveyed into the double-shaft shredder through the chain conveyor, which reduces the size of the raw materials through the shearing, squeezing and tearing effect of the blades, and then fall onto the output belt, which will be sorted by the magnetic separation equipment to separate the ferrous metals, non-ferrous metals and non-metallic materials, and be sent out by the respective conveyor. The non-ferrous metals and non-metallic materials will be sorted again by the magnetic separation equipment on the conveyor to pick out the free ferrous metals, so as to improve the recovery efficiency of ferrous metals. At the same time, the non-ferrous metals are sorted by the Eddy Current Sorting Machine to improve the recycling efficiency.