Fermentation-special soybean cake powder is a nutritional nitrogen source specially developed for microbial fermentation by application experts combined with fermentation experts. It uses high-quality non-GMO soybeans as raw material, refined through processes such as impurity removal, dehulling (or non-dehulling), and degreasing (non-degreasing or partial degreasing). The production process is mature with a strict quality system guarantee. It has high protein content, good fermentation applicability, and high biological potency. It can be widely used in the fermentation of antibiotics, enzyme preparations, steroid hormones, organic acids and other products, and can replace organic nitrogen such as peptone and yeast extract. Customized products can be made according to customer requirements.