NOVELTY - Microbial fermentation agent comprises 20-25 pts. wt. soybean extract, 1-2 pts. wt. Bacillus subtilis, 3-4 pts. wt. silicate bacteria, 2-4 pts. wt. green Trichoderma viride, 8-12 pts. wt. Lactococcus lactis, 2-4 pts. wt. actinomycetes, 1-2 pts. wt. Bacillus mucilaginosus, 2 pts. wt. Flavobacterium oryzae, 3-6 pts. wt. yeast, 10-13 pts. wt. Azotobacter chroococcum, 8-12 pts. wt. cellulose, 8-12 pts. wt. protease, and 5-6 pts. wt. phosphorylase.    USE - The fermentation agent is useful for treatment of municipal sludge (claimed).    ADVANTAGE - The fermentation agent: utilizes the soybean extract, which greatly improves the enzyme activity; reduces the heating and fermenting time in substrate fermentation process; enriches the nutrition components after fermentation; increases working efficiency; increases absorption and utilization rate of fermenting agent; has simple preparation process; utilizes multiple microorganisms; can decompose municipal sludge to change waste into treasure; is good for beautifying the municipal areas.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the microbial fermentation agent, comprising (a) preparing the soybean extract by (i) cleaning, drying and crushing soybeans, and passing through 1 mm diameter of filter screen to obtain soybean powder; (ii) adding 0.05 mol/l phosphate buffer to the soybean powder to adjust the pH to 5.2, uniformly stirring to obtain liquid I, where amount of phosphate buffer is 10 ml/ per gram soybean powder; (iii) centrifuging the resulting liquid under rotating speed of 6000 rotations/minute for 30 minutes, dissolving the precipitate, adjusting pH to 6.5 by adding 0.05 mol/l phosphate buffer, centrifuging under rotating speed of 4000 rotations/minute for 15 minutes, collecting supernatant, and centrifuging for two times to obtain soybean extract; (b) weighing the other remaining components; (c) uniformly stirring B. subtilis, silicate bacteria, green T. viride, L. lactis, actinomycetes, B. mucilaginosus, F. oryzae, yeast and A. chroococcum, gradually adding protease, phosphorylase and cellulase to obtain composite liquid; (d) ultrasonically processing the soybean extract under frequency of 20 kHz for 20 minutes, stopping processing after 3 minutes 15 seconds, then adding the soybean extract to the composite liquid, and stirring uniformly.