Fermented soybean meal combines modern bioengineering fermentation strain technology with traditional Chinese solid fermentation technology, uses high-quality soybean meal as the main raw material, inoculates microorganisms, and eliminates anti-nutritional factors in soybean meal to the greatest extent through microbial fermentation, effectively degrading soybean protein as high-quality Small peptide protein source, and can produce probiotics, oligopeptides, glutamic acid, lactic acid, vitamins, UGF (unknown growth factor) and other active substances. It improves palatability, promotes digestion and absorption of nutrients, promotes growth, and reduces diarrhea.