NOVELTY - Bio-organic fertilizer preparation involves weighing weathered coal (25 parts), and then adding crushed urea (2 parts) and dried cattle excrement (70 parts) to the weighed material. The obtained mixture is mixed uniformly, where the water content of the mixture is adjusted to 60%. The obtained material is placed in a compost fermentation device, and then stacked at 30-65 degrees C for 30 days. The obtained material is decomposed completely. The obtained material is crushed, and then sieved through a sieve (100 meshes) to obtain powder. The obtained powder is mixed with sulfur (3 parts) uniformly.    USE - Method for preparing bio-organic fertilizer (claimed) used for cotton, corn, cucumber and melon production.    ADVANTAGE - The method enables to produce the bio-organic fertilizer that has improved crop growth, soil fertility and crop yield, particularly cotton (7.3%), corn (12.4%), melon (8.2%),and cucumber (10.9%).    DETAILED DESCRIPTION - Bio-organic fertilizer preparation involves weighing weathered coal (25 parts), and then adding crushed urea (2 parts) and dried cattle excrement (70 parts) to the weighed material. The obtained mixture is mixed uniformly, where the water content of the mixture is adjusted to 60%. The obtained material is placed in a compost fermentation device, and then stacked at 30-65 degrees C for 30 days. The obtained material is decomposed completely. The obtained material is crushed, and then sieved through a sieve (100 meshes) to obtain powder. The obtained powder is mixed with sulfur (3 parts) uniformly. The obtained mixture is granulated, and then dried at 120-210 degrees C, where the water content is 8%. The dried granules are cooled. A mixture of Bacillus pumilus and functional agent (5%) is sprayed on the obtained granules, where the preservation number of Bacillus pumilus has CCTCC NO: M2014052. The obtained granules are adsorbed inoculants, and then dried at 55 degrees C. The obtained material is packed to obtain bio-organic fertilizer.