NOVELTY - Preparing organic complex fertilizer using waste animal keratin material as raw material comprises adding e.g. pre-treated waste animal keratin material and water into a reaction kettle, soaking, adding an alkaline substance, heat refluxing, cooling to room temperature, adjusting the pH value to 5-7 using an acidic substance to obtain mixture A, adding e.g. urea, crushed straw, humic acid substance and water to mixture A, uniformly mixing, piling, and stacking under ventilating conditions to obtain mixture B, drying mixture B in an oven, and crushing using a crusher to obtain powdered solid.    USE - The method is useful for preparing organic complex fertilizer using waste animal keratin material as raw material.    ADVANTAGE - The organic complex fertilizer is nutrition-rich and environment-friendly, has persistent and high fertilizing efficiency, and can be easily absorbed. The method utilizes waste animal keratin for fertilizer preparation and hence reduces its pollution pressure, and satisfies the requirements of modern green agriculture.    DETAILED DESCRIPTION - Preparing organic complex fertilizer using waste animal keratin material as raw material comprises: (i) adding (in parts by wt.) pre-treated waste animal keratin material (100), urea (10) and water (700-900) into a reaction kettle equipped with a stirrer, a condenser and a thermometer, soaking for 2-5 hours, and then adding an alkaline substance (14-40 parts by wt.) into the reaction kettle, heat refluxing at 70-90 degrees C for 4-8 hours under stirring conditions, cooling to room temperature, adjusting the pH value to 5-7 using an acidic substance to obtain mixture A; (ii) adding (in parts by wt.) urea (0-70), crushed straw or sawdust (10-40), humic acid substance (10-20), loess (5-10) and water to mixture A, uniformly mixing, piling, and stacking at 25 degrees C for 10-20 days under ventilating conditions to obtain mixture B; and (iii) drying mixture B in an oven, and crushing using a crusher to obtain powdered solid as product.