The grab truck or forklift grabs the waste home appliances and puts them on the metal chain plate conveyor, which is evenly and continuously transported to the inside of the twin-shaft shredder. Twin-shaft shredder utilizes the principle of mutual shearing and tearing between two relatively rotating knives to crush the home appliances, and the output metal materials are sucked away by the self-discharging iron remover configured on top of the belt conveyor and sent to the metal collection box for collection, while the other materials are output through the sealed belt conveyor, and finally pulled away by the garbage transfer truck.