The invention discloses a high-efficiency multi-
bacterial activity biogas residue 
biofertilizer and a preparation method thereof, and relates to the field of farm fertilizers. The 
biofertilizer is prepared by mixing and granulating 44 to 54 weight parts of 
biogas residue, 10 to 15 weight parts of 
potassium chloride, 10 to 15 weight parts of 
humic acid, 0.4 to 0.6 part of secondary and micro-element, 0.4 to 0.6 weight part of microbe, 5 to 10 weight parts of 
urea, 10 to 15 weight parts of monoammonium 
phosphate and 5 to 10 weight parts of 
ammonium chloride. The high-efficiency multi-
bacterial activity biogas residue 
biofertilizer has the characteristics of better multiple 
bacteria co-existing environment, stronger bioactivity, higher 
fertilizer efficiency, complete organic matters, effective micropopulations and chemical nutrients, controlled-release effect and the like, can be used as a 
fertilizer for rice, also can be used as a 
fertilizer for Upland food crops, vegetables, melons and fruits and fruit trees, and can improve the 
fertility of land and the 
utilization rate of the fertilizer, improve the quality of agricultural products, enhance 
plant diseases and 
insect pest resistance and 
drought resistance, purify and repair soil and the like after being applied.