Compound microbial feed additive and preparation method thereof

The invention discloses a compound microbial feed additive and a preparation method thereof. The compound microbial feed additive is prepared from the following raw materials in parts by weight: 30-50 parts of lactic acid bacteria powder, 30-50 parts of saccharomyces cerevisiae powder, 10-15 parts of enzyme acidifying agent, 10-15 parts of oligosaccharide, 30-50 parts of bacillus subtilis dry powder, 20-30 parts of echinacea polyphenol, 10-15 parts of radix glycyrrhizae powder, 5-10 parts of herba taraxaci and 5-10 parts of pine needles. The compound microbial feed additive of the present invention can effectively improve the immune function of animals, promote generation of cell factors in the animals, generate antibacterial substances such as bacteriocin and inhibit growth of pathogenic bacteria in the animals, thereby minimizing disease probability of the animals. Meanwhile, the compound microbial feed additive facilitates growth and differentiation of epithelial tissues and development of bones in the ani