The invention provides a bacillus subtilis for effectively degrading grease. The bacillus subtilis 6-loil is preserved at Guangdong Province Microbiological Culture Collection Center on December 22, 2016. The preservation number is GDMCC No. 60134. The bacillus subtilis 6-loil provided by the invention can utilize the grease as a growth carbon source, can normally grow under an environment of higher grease content and has a capacity of efficiently degrading grease. The bacillus subtilis 6-loil provided by the invention can be compounded with bacillus coagulans, brewer yeast and carrier ingredients so as to be prepared into a kitchen garbage disposal fungicide. The prepared kitchen garbage disposal fungicide can adapt to the condition of high grease content of the domestic kitchen garbage, so that the condition of failure in aerobic composting caused by the reduction of microbial activity resulted from the microorganism wrapped by the grease in aerobic composting can be effectively avoided and the bacillus subtilis can meet the requirement of the domestic kitchen garbage aerobic composting. The bacillus subtilis 6-loil also can be applied to the fields of soil oil stain treatment, biosurfactant production, biological detergent preparation, and the like.