The invention provides bacteria for degrading cellulose and microbial inoculum prepared by same, which both belong to the bio-technology field. YN1 microbial strain is added to a PDA plating culture medium, PDA liquid culture medium, a seed tank culture medium and a production culture medium, and the effectively live bacteria of the microbial strain reaches over 100 million/ml. After the YN1 bacterial strain is cultivated through fermentation, the activity of incision enzyme, excision enzyme, beta-glycosidase, xylanase and cellulase is respectively 95.7 U/mL, 14.6 U/mL, 20.5 U/mL, 71.6 U/mL and 26.6 U/mL. After the YN1 bacterial strain is cultivated through solid fermentation, the activity of incision enzyme, excision enzyme, beta-glycosidase, xylanase and cellulase is respectively 1192.2 U/g, 100.6 U/g, 136.9 U/g, 1118.0 U/g and 210.7 U/g. The YN1 microbial strain can degrade 41.87% straws and 31. 59% rice husks in 7 days.