NOVELTY - Compound biological fertilizer, is prepared by mixing compound fertilizer and aqueous bacterial spore in a mass ratio of 6.7-16.7:1 obtained by mixing Bacillus subtilis and jelly-like Paenibacillus spore in water in a ratio of 1:1.1-1.3, where the compound fertilizer comprises 16 %mass nitrogen, 16 %mass phosphorus-containing element, and 16 %mass potassium-containing element, and mixing the aqueous bacterial spores in the embedding reagent in a volume ratio of 1:8-1:5.    USE - As compound biological fertilizer.    ADVANTAGE - The fertilizer prevents outside influence on beneficial bacteria.    DETAILED DESCRIPTION - Compound biological fertilizer, is prepared by mixing compound fertilizer and aqueous bacterial spore in a mass ratio of 6.7-16.7:1 obtained by mixing Bacillus subtilis and jelly-like Paenibacillus spore in water in a ratio of 1:1.1-1.3, and where the compound fertilizer comprises 16 %mass nitrogen, 16 %mass phosphorus-containing element, and 16 %mass potassium-containing element, and mixing the aqueous bacterial spores in the embedding reagent in a volume ratio of 1:8-1:5, where the strains of B.subtilis and jelly-like Paenibacillus spores are generated in the fermentation broth, the reagent comprises a first embedding and second embedding reagents, the first embedding reagent comprises 2-4 %mass sodium alginate aqueous solution and the second embedding reagents comprises 2-4 %mass calcium chloride aqueous solution. An INDEPENDENT CLAIM is included for method for preparing the compound biological fertilizer, which involves (a) preparing the first and second bacterial suspensions, (b) preparing the above-mentioned first and second bacterial spore, mixing the obtained bacterial spore in step (a) with the first embedding solution uniformly to obtain mixed solution, mixing the obtained mixed solution with the second embedding agent in a volume ratio of 1:8-1:5, to obtain a bacterial spore with the grain diameter of 1-5 mm, immobilizing the obtained spore at 4 degrees C for 10-24 hours, washing with sterile water to remove calcium chloride and drying at 40 degrees C in oven to obtain dry bacterial spore with the diameter of 0.5-2 mm, and (d) mixing compound fertilizer and aqueous bacterial spore in a mass ratio of 6.7-16.7:1 obtained by mixing Bacillus subtilis and jelly-like Paenibacillus spore in water in a ratio of 1:1.1-1.3.