The present invention relates to a 
straw microorganism decomposing 
bacterial agent, which is prepared mainly from a 
straw microorganism decomposing bacterial liquid and a 
protein nutrition agent according to a volume ratio of 1:1, wherein the 
straw microorganism decomposing bacterial liquid preparation method comprises: carrying out sealed 
fermentation on a straw mixture to obtain 
bacteria, and carrying out 
in vitro culture on the 
bacteria by using a microorganism culture medium to obtain the straw microorganism decomposing bacterial liquid. According to the present invention, the composting 
heat generation bacteria are obtained by using the straw mixture 
fermentation process, and are subjected to 
enrichment culture, the obtained composting 
heat generation bacteria are mixed with the 
protein-rich 
protein nutrition agent to obtain the straw microorganism decomposing 
bacterial agent; the obtained straw microorganism decomposing 
bacterial agent can produce the heat during the straw composting process so as to effectively supply the temperature required by bacterial breeding; and the protein 
nutrition agent supplies the 
nitrogen source, such that a lot of the microorganism can be bred by using the 
nitrogen source supplied by the protein nutrition agent at the early microorganism 
fermentation stage so as to improve the 
compositing rate, effectively shorten the time required by the fertilization, and solve the problems of less functional microorganism, slow breeding and serious 
nitrogen loss at the early fertilization stage in the fertile soil fertilization process using the straw composting 
fertilizer.