Bio-organic fertilizer for killing underground insect pests by using biological agent and preparation method of bio-organic fertilizer

The invention discloses a bio-organic fertilizer for killing underground insect pests by using a biological agent and a preparation method of the bio-organic fertilizer. The bio-organic fertilizer is prepared from the following raw materials in parts by weight: 5-15 parts of a beauveria bassiana agent, 10-20 parts of cow dung, 20-30 parts of pig manure, 10-15 parts of chicken manure, 10-15 parts of cassava residues, 5-10 parts of furfural residues and 15-25 parts of sesame-seed cakes. The beauveria bassiana agent comprises the following components in parts by weight: 40-50 parts of a beauveria bassiana spore powder mother drug, 20-30 parts of a beauveria buchneri spore powder mother drug, 20-30 parts of corn flour and 10-20 parts of glucose powder. The preparation method comprises the following steps: (1) preparing a base fertilizer; (2) performing microbial inoculum culture; (3) airing the base fertilizer; and (4) performing microbial agent mixing. The organic fertilizer provided by the invention utilizes a