Disease-preventing and growth-promoting bio-organic fertilizer and preparation method thereof

The invention discloses a disease-preventing and growth-promoting bio-organic fertilizer and a preparation method thereof, and belongs to the technical field of organic fertilizers. The fertilizer is prepared from 60-80 parts of plant straw powder, 10-30 parts of a compound microbial agent, 20-30 parts of an organic auxiliary material, 30-50 parts of corn flour, 80-100 parts of rabbit manure and 1-2 parts of an active agent. The compound microbial agent is prepared from trichoderma longibrachiatum, brevibacillus laterosporus and aspergillus aculeatus according to the mass ratio of 1: 1: 1; and the active agent is polyethylene glycol 400. The fertilizer is rich in organic matters and multifunctional microorganisms, and the elements provide comprehensive nutrients for crops, so that not only is the quality of crop products improved, but also conditioning and health care effects on crop growth can be achieved, and the yield of the products is increased; meanwhile, crop rhizosphere microbiota can be improved, the