Double step recycling granulating machine: consists of an forced feeding extruder, a single screw extruder, vacuum exhausting unit, filter exchanging unit, pelletizing device and so on. Increase the diameter of feeding section of screw. Compressor with a larger volume of the compression ratio. The vacuum device on the connecting place between two machines, can effectively exclude the gases of volatile material. Can be used directly out of waste products. Not only the ordinary recyclable plastics, but also foam PS, PE, EVA and other products. According to different materials, production, equipped with different types of screw.