NOVELTY - Organic fertilizer comprises 1 kg microorganism-fertilizer composition and 5-20 ml microbial agents, where the microorganism-fertilizer composition includes animal manure, sludge of aquatic product, potassium chloride and calcium carbonate, and the microbial agent includes nitrogen-fixing bacteria, Bacillus laterosporus, silicate bacteria, B.megaterium, B.cereus, Lactobacillus, and phosphate-solubilizing bacteria.    USE - As organic fertilizer.    ADVANTAGE - The fertilizer is granular and convenient to use, and can be used directly or after being diluted in water.    DETAILED DESCRIPTION - Organic fertilizer comprises 1 kg microorganism-fertilizer composition and 5-20 ml microbial agents, where the microorganism-fertilizer composition includes 30-55 pts. wt. animal manure, 20-40 pts. wt. sludge of aquatic product, 5-15 pts. wt. potassium chloride and 5-15 pts. wt. calcium carbonate, and the microbial agent includes nitrogen-fixing bacteria, preferably Azotobacter chroococcum in an amount of 3.6-6.8x 107 cells/ml, Bacillus laterosporus in an amount of 2.5-5.5x 107 cells/ml, silicate bacteria in an amount of 3.6-6.8x 107 cells/ml, B.megaterium in an amount of 1.8-3.5x 107 cells/ml, B.cereus in an amount of 3.6-6.8x 107 cells/ml, Lactobacillus in an amount of 3.6-6.8x 107 cells/ml, and phosphate-solubilizing bacteria in an amount of 3.6-6.8x 107 cells/ml. An INDEPENDENT CLAIM is included for method for preparing the organic fertilizer, which involves (a) drying the animal manure and sludge of aquatic product such that moisture content is maintained at 40-80%, mixing the dried components with potassium chloride and calcium carbonate to obtain microorganism-fertilizer composition, (b) inoculating and culturing each microbial agent in basic solid culture medium, respectively to obtain strain, (c) inoculating and secondary culturing the obtained strains in the secondary culture medium, respectively, to obtain secondary strains, (d) providing nutrient solution to each strain to adsorb, (e) spraying the comprises obtained in the step (a) to the product obtained in the step (d), uniformly mixing and piling the mixture in a dark ventilated place, performing fermentation at 40-60 degrees C for 2-3 days, and drying the fermented fertilizer composition till the water content of the composition is 15-35%, and (f) crushing the dried fertilizer composition using a crusher to obtain product having particle size of less than 3 mm.