This small shredder machine is designed and applicable to intractable, hard and irregular enginerring plastics such as thick pipes, lumps from extruder, package barrels, buckets, trays,ruber, wood, etc. Working with medium speed and tenderly, low noise, low power consumption. Rotary knife designed symmetrically, can be exchanged four times for use, which prolong use long life span. When push materials by hydraulic, can select speed and presure freely according to different materials load. It is with low labor strength, safe& reliable operation.