NOVELTY - Preparing bio-organic fertilizer, by preparing seed solution of bacteria controlling blight disease using culture medium containing beef extract enriched peptone, culturing the bacterial seed solution using domestic garbage hydrolyzate as substrate, mixing the pig manure with filling material, decomposed pig manure compost and bamboo vinegar stock solution and then composting in the presence of ventilation to obtain pig manure compost, and mixing the substrate after fermentation culture with the pig manure compost in the ratio of 1:3-5 to obtain bio-organic fertilizer.    USE - The method is useful for preparing bio-organic fertilizer for treating blight disease in crops (claimed). The fertilizer can also be used to prevent blight disease.    ADVANTAGE - The fertilizer effectively preventing blight disease in crops is prepared using organic solid waste, such as domestic garbage and pig manure.    DETAILED DESCRIPTION - Method for preparing bio-organic fertilizer, involves (i) preparing seed solution of bacteria controlling blight disease using culture medium containing beef extract enriched peptone by liquid fermentation culture, (ii) hydrolyzing domestic garbage, using solid hydrolyzate as substrate and adding 0.1-0.2 l/kg of the bacterial seed solution to the substrate, mixing uniformly, adjusting the water content of the substrate to 45-55%, carrying out fermentation culture for 5-7 days until the number of viable bacteria is more than 1x 1010/g of the substrate, (iii) mixing the pig manure having 70-75% water content with filling material, decomposed pig manure compost and bamboo vinegar stock solution, where each ton of pig manure is added (in kg) with filling material (70-150), decomposed pig manure compost (40-70), and bamboo vinegar stock solution (2-6 l), (iv) adding obtained mixture in compost groove and subjecting to compost treatment in the presence of ventilation (20-25 m3/(h.t)) to obtain pig manure compost, where the compost becomes thoroughly decomposed after 50-70 days, and (v) mixing the substrate after fermentation culture with the obtained pig manure compost in the ratio of 1:3-5 to obtain the bio-organic fertilizer.