Fermented soybean meal combines modern biotechnology fermentation strain technology with traditional Chinese solid fermentation technology, using soybean meal as the main raw material, inoculating microorganisms, and through microbial fermentation, eliminating anti nutritional factors in soybean meal as much as possible, effectively degrading soy protein as a small peptide protein source, and producing active substances such as probiotics, oligopeptides, glutamic acid, lactic acid, vitamins, UGF (unknown growth factors), etc. It can improve palatability, promote digestion and absorption of nutrients, promote growth, and reduce diarrhea.