The invention discloses a method for promoting fermentation and growth of butylic acid bacteria, and belongs to the field of food fermentation. According to the method, fermentation and growth of the butylic acid bacteria are promoted by reducing production of acidic products during fermentation. The method comprises that tyrosine aqueous solution is added through fed-batch in a sterile and anaerobic mode within 1h after the butylic acid bacteria starts fermentation, and the total concentration of tyrosine is 0.0125-0.05g/L. According to the method, the tyrosine is used as metabolic regulation molecules, and the production efficiency of acetic acid and butyric acid is remarkably reduced by addition of tyrosine molecules, thus effectively mitigating acid stress, promoting growth of the butylic acid bacteria, and bringing about a great technical effect. The method has the characteristics of clear components, easily available raw materials, low usage concentration, low material supplement costs, high operation controllability, and applicability to fermentation production of the butylic acid bacteria.