NOVELTY - Bio-organic fertilizer comprises inorganic elements and organic active ingredients, where the inorganic elements account for 8-15% of the total weight by counting pure nutrients and include nitrogen, phosphorus and potassium fertilizer in a weight ratio of 1:0.3-0.8:0.2-0.9, and essential microelements accounting for six per ten thousand to ten per thousand by counting pure nutrients, the organic active ingredients include organic auxiliaries and functional strains with adding amount of 5-8%.    USE - The bio-organic fertilizer is useful for sweet corn (claimed).    ADVANTAGE - The bio-organic fertilizer is low in fertilizing amount, improves the yield and quality sweet corn, and output and input ratio is increased by one to two times.    DETAILED DESCRIPTION - Bio-organic fertilizer comprises inorganic elements and organic active ingredients, where the inorganic elements account for 8-15% of the total weight by counting pure nutrients and include nitrogen, phosphorus and potassium fertilizer in a weight ratio of 1:0.3-0.8:0.2-0.9 and essential microelements accounting for six per ten thousand to ten per thousand by counting pure nutrients, the organic active ingredients include organic auxiliaries and functional strains with adding amount of 5-8%. The functional strains are Brevibacterium, Bacillus, Saccharomycetes and photosynthetic bacteria screened from effective microorganisms (EM). The organic material can be prepared by mixing the livestock manure and crop waste to make the carbon and nitrogen in a ratio of 15-25:1 and water content is 45-65%, and then obtaining the organic auxiliary material by EM bacterial liquid ferment, where the inoculation quantity of the EM bacteria liquid is 5-10% of total weight of the organic auxiliary material. An INDEPENDENT CLAIM is included for method for preparing the biological organic fertilizer, which involves culturing the strain to amplification culture to obtain the EM bacteria solution, performing enzymolysis with the fermented raw material for livestock and poultry excrement and crop waste to nitrogen and carbon in a ratio of 15-25:1 having the water content of 45-65%, mixing the EM bacteria liquid with a bulk shape in a fermentation tank, fermenting at 50-75 degrees C for 3-5 days, eliminating and discharging wine flavor, fermenting the organic material, mixing organic auxiliary material with the inorganic elements and functional strain to obtain biological organic fertilizer semi-finished product, and drying the biological organic fertilizer semi-finished product to remove water to obtain organic finished product at 50-75 degrees C.