NOVELTY - High-efficiency organic compound fertilizer comprises organic fertilizer produced from livestock manure to which urease inhibitor i.e. N-(n-butyl) thiophosphoric triamide (NBPT) is added, grass peat, and maize straw, by composting. It comprises (pts.wt.) decomposed organic material as fertilizer (15-35) to which NBPT (1-3 wt.% based on dry weight of organic fertilizer) is added, carbamide (10-22), NBPT (0.05-0.10), monoammonium phosphate (18-30), potassium chloride (0-25) or potassium sulfate (0-25), microelement (0-3), magnesia (0-1), and clay (8-12).    USE - High-efficiency organic compound fertilizer used for improving soil and plant growth.    ADVANTAGE - The fertilizer realizes the application effect of balanced fertilization by adjusting and controlling the nitrogen content of compost, adjusting and controlling the soil urease to a certain degree, stabilizing ammonium ion, improving the utilization rate of nitrogen, and keeping the mixture ratio of the three elements of nitrogen, phosphorus, and potassium relatively stable in the soil. It has improved utilization rate; and can satisfy and supply multiple nutrients needed by plant growth, protect the ecological environment, and improve the yield and quality of crop.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of high-efficiency organic compound fertilizer comprising granulating after crushing the organic fertilizer and other raw materials and mixing. The preparation specifically comprises:    (A) crushing maize straw with water content of 20-35 wt.% into less than or equal to 40 mesh; and uniformly mixing maize straw (60-70 pts.wt.), grass carbon (10-20 pts.wt.) with water content of 20-30 wt.%, and livestock manure (10-25 pts.wt.) with water content of 60-85 wt.%;    (B) stacking in a wood box as triangular stack to perform open-air decomposition, where open-air temperature is controlled at 15-35 degrees C; and adjusting the water content of the mixed material at 55-66 wt.% and the ratio of carbon to nitrogen at 30:1-25:1;    (C) adding microbial composite bactericide 301 (one to third millionths of the weight on dry basis of livestock manure, maize straw, and grass carbon);    (D) performing open-air aerobic fermentation; turning and stirring; controlling the best reaction environment so that the material is in full contact with oxygen; adding urease inhibitor (1-3 wt.% based on dry weight of livestock manure, maize straw, and grass carbon) for nitrogen deodorization, during turning for the first time, where fermentation cycle is 25-40 days; turning and stirring for 2-4 times a week during the first two weeks; and turning and stirring for 1-3 times a week, where total frequency of turning and stirring is 10-15 times, and the final water content of the material mixture is 25-30%;    (E) screening out the un-decomposed large particle material with diameter of more than 20 mm by a screen; turning and stirring; adding the thoroughly decompressed particle with diameter of less than or equal to 20 mm to a stirrer; and stirring uniformly;    (F) feeding into a roller drier to dry; and    (G) cooling to obtain black high-efficiency organic fertilizer with high-nitrogen content, where water content of organic fertilizer should be 5-20 wt.% and drying temperature is 60-120 degrees C.