In recent years, with the rapid development of the information industry, all kinds of electronic products are becoming more and more popular, and the upgrading speed of electronic products is also significantly accelerated. The following is that the annual production of “electronic waste” in various countries has reached millions to tens of millions of tons. Aiming at the above problems, China renewable technology has developed the DS40 series shredder, which uses the working principle of mutual shearing, tearing and extrusion between knives to process old refrigerators, televisions, washing machines and other household electrical appliances. According to different material characteristics and production capacity requirements, corresponding knives and knife body arrangement are configured to effectively improve production efficiency.