NOVELTY - Preparation of biological compound fertilizer comprises mixing and granulating 5-18 pts. wt. glial Bacillus spores, 2-6 pts. wt. solubilizing bacteria, 5-10 pts. wt. potassium bacteria solution, 18-30 pts. wt. Bacillus subtilis (CGMCC 7926) culture, 5-10 pts. wt. Aspergillus awamori culture, and 3-8 pts. wt. Lactobacillus plantarum (CGMCC 7928) agent.    USE - Preparation of biological compound fertilizer.    ADVANTAGE - The biological compound fertilizer can enhance crop drought resistance, uses composite strains that provide strong solution of potassium silicate bacteria, and produces bacteria that can secrete growth hormone and other substances and growth-promoting substances to increase root seedlings. It allows silicon decomposition in soil to thicken plant wax layer, thus increasing water retention capacity of plants, promoting formation of soil aggregate structure, and preventing soil compaction. It destroys soil capillarity to prevent evaporation of soil moisture.    DETAILED DESCRIPTION - Preparation of biological compound fertilizer comprises mixing and granulating 5-18 pts. wt. glial Bacillus spores, 2-6 pts. wt. solubilizing bacteria, 5-10 pts. wt. potassium bacteria solution, 18-30 pts. wt. Bacillus subtilis (CGMCC 7926) culture, 5-10 pts. wt. Aspergillus awamori culture, and 3-8 pts. wt. Lactobacillus plantarum (CGMCC 7928) agent. The B. subtilis culture is prepared by transferring fermentation liquor from slant culture of B. subtilis into access fermenter for seed culture; filtering fermentation liquor through plate and frame filter; and drying to obtain B. subtilis culture. The L. plantarum agent transferring seed culture from slant culture of L. plantarum into access fermenter; completing and concentrating fermentation broth in vacuum at low temperature into 45% of its original volume to obtain concentrated solution of bacteria; adding concentrated solution with carrier consisting of 20-30 pts. wt. calcium carbonate, and 10-15 pts. wt. dextrin, in which weight ratio of concentrated solution of bacteria and carrier is (0.5-0.6):1; uniformly mixing; and drying in fluidized bed at 50 degrees C. The A. awamori culture is prepared by inoculating Aspergillus oryzae spores into solid state fermentation compound; culturing at 26-33 degrees C to obtain full hypha culture material; drying in cold fluidized bed; and crushing.