Fuente: WIPO "organic farming" The invention relates to a preparation method of a special organic fertilizer for organic farms, belonging to the technical field of production and application of special organic fertilizers for functional organic farms. The preparation method comprises the following steps: crushing organic materials and thoroughly mixing according to a carbon-nitrogen ratio of (20-30):1; after adjusting the solid content, pumping the mixture into a fermentation tank, and inoculating a microbial inoculum; carrying out anaerobic fermentation to obtain an anaerobic fermentation liquid; mixing the anaerobic fermentation waste residue and the organic materials according to a carbon-nitrogen ratio of 25:1; and carrying out facultative composting by a strip piling method for 30 days to respectively prepare a carbon-enriched fertilizer and a nitrogen-enriched fertilizer. The invention can be respectively applied to carbon sequestration and carbon sink of soil in organic farms, and a base fertilizer for crop growth and a supplementary fertilizer in the plant growth process; and meanwhile, a matched fertilizer application technology is utilized to optimize the functions of the organic fertilizer so as to further enhancing the nutrient utilization ratio.