NOVELTY - Preparation of biological organic fertilizer by preparing sugarcane, animal excrement, bagasse, biological strain and clean water; drying sugar cane leaf, soaking in lime water, leaching, draining water, fermenting; drying animal excrement, crushing; mixing fermented sugarcane, animal excrement, bagasse and biological strain, spraying water, mixing; piling mixed material, anaerobic fermenting; turning, fermenting, turning, covering using plastic material cloth, fermenting; carrying out enzymolysis; and packaging.    USE - Method for preparing biological organic fertilizer (claimed).    ADVANTAGE - The method is simple, and utilizes sugar cane which reduces environmental pollution, promotes production of sugar cane for sustainable development, prolongs industry chain and increases the income of farmers. The fertilizer has low cost.    DETAILED DESCRIPTION - Preparation of biological organic fertilizer using sugarcane as main raw material comprises:    (A) preparing 550 kg sugarcane, 250 kg animal excrement, 200 kg bagasse, 2 kg biological strain and 1000-1200 kg clean water;    (B) taking sugar cane leaf, drying until the water content is less than 20%, soaking in 3% lime water, leaching for 20-30 minutes, taking out and draining water, stacking and fermenting for 15-20 days;    (C) taking animal excrement, drying until water content is less than 20%, crushing to 30-40 meshes particle size;    (D) mixing fermented sugarcane, animal excrement, bagasse and biological strain, stirring uniformly, spraying water, mixing, regulating water content to 55-65%;    (E) piling mixed material to 2-2.5 m high and 1-1.2 m width, covering with plastic film cloth, anaerobic fermenting;    (F) turning when inner temperature reaches 60 degrees c, fermenting for 3-4 days, turning, covering using plastic material cloth, closing, fermenting for 5-6 days, or until mixture becomes brown, soft and elastic;    (G) carrying out enzymolysis to fermented mixture at 50-60 degrees c until water content is less than 10%; and    (H) packaging.