Bacillus subtilis without specific resistance gene and application thereof

The invention discloses a bacillus subtilis strain without a specific resistance gene, the bacillus subtilis strain without the specific resistance gene is named as BSC6 [delta] A8, and the preservation number of the bacillus subtilis strain without the specific resistance gene in the China Center for Type Culture Collection is CCTCC NO: M20221478. The bacillus subtilis without the specific resistance gene is more sensitive to antibiotic concentration response of clindamycin, lincomycin, streptomycin and spiramycin, and is higher in biological safety. After mixed fermentation with wheat straw for 48 hours, the surface morphological structure of the wheat straw can be effectively destroyed, the cellulose crystallinity of the wheat straw can be reduced by about 6%, the content of neutral detergent fibers (NDF) and the content of acid detergent fibers (ADF) of the wheat straw can be reduced to 6.6% and 12.1% respectively, and the strain has the potential of being further applied to biological feed production and