NOVELTY - Microbial agent comprises functional strain and adsorbent. The functional strain comprises Bacillus subtilis, B. megatherium, Trichoderma longibrachiatum, and Aspergillus niger at 0.5-2:0.5-2:0.5-2:0.5-2 mass ratio.    USE - Microbial agent used in straw compost production.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of microbial agent comprising fermenting functional strain, adsorbing by adsorbent, and drying. The functional strain fermentation comprises mixing B. subtilis and B. megaterium, slant culturing at 4 degrees C in 100 ml Luria Bertani (LB) culture medium, adding the material into 250-ml shaking flask, shake-flask culturing at 35 degrees C and 170 revolutions/minute (rpm) for 24 hours, activating and culturing, taking 10% activated strain, filling into 1000-ml shaking flask, adding 500 ml LB culture medium, culturing at 35 degrees C and 170 rpm for 12 hours to obtain the seed liquid, seed liquid fermenting in seed liquid culture medium by inoculating 10% seed liquid into seed fermentation tank and fermenting at 35 degrees C and 180 rpm for 24 hours to obtain fermentation seed liquid, fermenting the fermentation seed liquid in fermentation culture medium by inoculating 10% of the fermentation seed liquid into fermentation tank, fermenting at 35 degrees C and 180 rpm for 48 hours to obtain fermentation bacterial liquid, where fermentation culture medium comprises 5 g/L glucose, 10 g/L peptone, and 10 g/L sodium chloride and has a pH of 7.0, and sterilizing at 121 degrees C for 25 minutes; or mixing T. longibrachiatum and A. niger, inoculating into 100-ml shaking flask, adding potato culture medium, fermenting at 30 degrees C and 170 rpm for 24 hours, activating and culturing, taking 10 vol.% activated strain and 500 ml potato culture medium, adding into 1000-ml shaking flask, fermenting at 30 degrees C and 170 rpm for 24 hours to obtain seed solution, adding 10 vol.% seed solution into seed fermentation tank containing culture medium, fermenting at 30 degrees C and 180 rpm for 24 hours, obtaining fermentation seed liquid, inoculating 10 vol.% fermentation seed liquid into fermentation tank, fermenting at 30 degrees C and 180 rpm for 60 hours to obtain fermentation liquid, where fermentation culture medium comprises 20 g/L corn powder and 5 g/L sucrose and has neutral pH, and sterilizing at 121 degrees C for 25 minutes.