Feed leavening agent and application thereof

The invention provides a feed leavening agent which comprises the following raw materials in parts by weight: 5-15% of a complex microbial inoculant, 5-20% of a complex enzyme agent, 0.5-2% of a compound additive, 0.1-1% of a protective agent and the balance of a carrier, the complex microbial inoculants comprise lactobacillus plantarum, cellulomonas dinitrogen, lactobacillus acidophilus, bacillus coagulans, bacillus subtilis, lactobacillus amyloliquefaciens, filamentous fungi, saccharomyces cerevisiae, aspergillus and clostridium butyricum; the compound enzyme agent is prepared from protease, cellulase, ligninase, xylanase, mannase, pectinase and amylase; the compound additive is prepared from oligosaccharides, calcium magnesium phytate and taurine. According to the feed leavening agent, under the combined action of the compound bacteria and the compound enzyme, cellulose, hemicellulose and lignin in straw can be better degraded, and auxiliaries including an accelerant, a taste modifier and nutritional ingre