The Hebei Beef Cattle Innovation Team has found a way to reduce the cost of beef cattle breeding by using discarded Pleurotus eryngii mushroom residue to develop beef cattle feed. The feeding experiment conducted at Chengde Zhihe Agricultural Development Co., Ltd. showed that after feeding Pleurotus eryngii mushroom residues, the average daily gain of fattening bulls increased, feed intake also increased, and empty cows showed improvement in estrus, posture, coat color, and facial appearance. The test data analysis also showed that adding 15% of Pleurotus eryngii fermentation residue to the diet significantly increased the average daily gain compared to the control group, indicating that the fermentation treatment of Pleurotus eryngii residue can be successful and effectively solves the shortage of local roughage resources.