NOVELTY - Producing multi-functional bio-organic fertilizer by plant source cake solid fermentation using Bacillus species comprises inoculating Bacillus strain into a culture medium, culturing to obtain a primary seed liquid, culturing, inoculating the seed liquid in culture medium, culturing to obtain a secondary seed liquid, adding glucose, sucrose or starch to the plant source cake solid, adding e.g. sodium glutamate, and dipotassium hydrogen phosphate, cooling to obtain solid culture medium, inoculating secondary strain, mixing, fermenting to obtain product, drying, and crushing.    USE - The fertilizer is useful preventing and treating plant diseases and promoting the growth of plants (claimed).    ADVANTAGE - The fertilizer is easy and simple to prepare with less energy consumption, economical, ecofriendly, nontoxic and safe to humans, and is suitable for industrial production.    DETAILED DESCRIPTION - Producing multi-functional bio-organic fertilizer by plant source cake solid fermentation using Bacillus species comprises (a) picking 1-2 Bacillus strain from an inclined plane or glycerol frozen bacilli, inoculating into a seed culture medium at 28-37 degrees C, culturing in a shaker incubator at a speed of 150-250 revolutions/minute for 8-16 hours to obtain a primary seed liquid, where the culture medium comprises (in wt.%) peptone (0.5-1), yeast powder (0.3-0.8) and sodium chloride (0.5-1), adjusting the pH to 7-7.5, culturing at 115-121 degrees C at a high pressure for 15-30 minutes; (b) inoculating the seed liquid (2-5%) in lysogeny broth (LB) culture medium, culturing at -37 degrees C at a speed of 150-250 revolutions/minute in a shaker incubator for 18-24 hours to obtain a secondary seed liquid; (c) adding 0-2% of glucose, sucrose or starch to the plant source cake solid, adding sodium glutamate (0-0.5%), dipotassium hydrogen phosphate (0-0.1%), magnesium sulfate (0-0.1), 10-50% of crop straw, wheat bran or rice bran, adjusting the humidity to 40-80% by using water, steaming at 100 degrees C for 20-30 minutes, cooling to obtain solid culture medium, respectively inoculating secondary Bacillus strain (0.1-5%) into solid culture medium, completely mixing, transferring into a fermentation plate with a thickness of 2-30 cm, fermenting at 28-40 degrees C or at room temperature, turning for once in every 8-14 hours after 36-48 hours to obtain fermented product; (d) blast drying the fermented product at 45-65 degrees C for 2-24 hours to obtain dried fermentation product; (e) crushing the dried fermented product by a crusher to obtain particles of size 60-100 meshes sieve, where the product is rich in poly- gamma -glutamic acid, (fat) peptide antibiotic substance, active amino acid and growth promoting rhizosphere, and disease resistant strains of multifunctional biological organic fertilizer.