The invention provides a compound biological feed additive for laying hens, which belongs to the technical field of feed science and feed additives. The feed additive of the invention comprises: feed-grade fulvic acid, insect meal, fermented insect excrement, extract compound preparation, microbe Ecological preparations and carriers are compounded according to a certain proportion. The premix of the compound biological feed additive is used in the feed of laying hens, which can not only regulate the internal environment of the digestive tract of livestock and poultry, regulate the balance of the intestinal flora of the body, enhance the immune function of the body, and has the functions of antibacterial, anti-stress, enhancing immunity, improving In terms of production performance, the feed additive of the present invention is added to the diet of laying hens to improve the production capacity and self-immunity of laying hens, improve the feed conversion rate, thereby reducing drug residues and improving the quality of eggs. It is a new type of safe, reliable, green and environmentally friendly feed additive product. , the application prospect is good.