In this process, the leftover scraps or out-of-specification sweet potato cut pieces produced in the sweet potato processing process are used as raw materials for standby. Through this process, out-of-specification sweet potatoes are made into "probiotic sweet potato cud" products, which can be used in animal feeding, replacing part of the feed corn, achieving the goal of circular agriculture and effectively reducing animal feeding costs. The sweet potato silage produced by this technology can replace 25％-30％ of the concentrate in the beef cattle ration, effectively reducing the cost of beef cattle feeding, and can promote the meat soft and tender, where the performance of fat marbling can reach the choice level or above, and some even reach the Prime level, successfully improving the quality and value of domestic beef.