Differential operation between four shafts, with functions of tearing, squeezing, biting, etc. The electrical part adopts Siemens electrical component programming control, with functions such as automatic detection of overload protection. The four-shaft shredder is suitable for the refinement of various large and difficult-to-break materials. It has the advantages of uniform discharge and controllable size. Materials such as woven bags, refrigerators, circuit boards and cartons. High efficiency, low speed, high torque and low noise. The four-shaft shredder has the characteristics of strong wear resistance and high strength. The differential operation between the four shafts has the functions of tearing, squeezing and biting.