NOVELTY - An organic fertilizer prepared by anaerobic fermentation of chicken manure comprises: 60-90% composting material prepared by aerobic composting of chicken manure or chicken manure and chicken litter mixture, 1-30% fermentation agent, and 1-10% corn bran.    USE - As organic fertilizer prepared by anaerobic fermentation of chicken manure (claimed).    ADVANTAGE - The organic fertilizer prepared by anaerobic fermentation of chicken manure solves problems that chicken manure directly prowls or causes pollution, realizes harmless treatment of manure and litter material, recycles its content in final product formed by beneficial bacteria including their metabolites, which can be used as fertilizer to improve soil, and further inhibits plant diseases and insect pests, improves soil structure, increases air permeability of soil, and promotes growth and cultivation of plant roots. The composting material prepared by aerobic composting of chicken manure or chicken manure and chicken litter mixture suppresses bacterial growth, controls metabolic direction, kills pathogenic microorganism, parasitic insects and heat-labile mixed fungi by heat, and at the same time, converts macromolecule substances and poisonous and harmful components by composting and bio-degradation into small molecular substance for use by bacteria. The second step of anaerobic fermentation amplifies beneficial bacteria, generates organic acid metabolites that improve soil ecological value, and produces metabolic products that increase nutrient materials for promoting growth of plants and cultivation of plant roots. The organic fertilizer is composite fertilizer suitable for different plants needs, and is quick-acting fertilizer, thus improves application effect.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method of using fermented chicken manure to produce organic fertilizer involving: according to mass percentage taking the components including 60-90% composting material, 1-30% fermentation agent, and 1-10% corn bran, mixing uniformly, controlling water content to 30-50%, performing anaerobic fermentation at room temperature in sealed environment to produce beneficial bacteria, and when pH is not greater than 6.5 or when beneficial bacteria number is more than 0.2 hundred million/g terminating the fermentation.