NOVELTY - Method for preparing organic fertilizer, involves stacking and drying the raw materials and auxiliary materials, carrying out facultative aerobic pre-fermentation of the mixture, fermenting the mixture, sampling and detecting the qualified fermented product, grinding, sieving and storing the product, piling the product, and packaging and sealing the product.    USE - The method is useful for preparing organic fertilizer which is useful for killing maggots.    ADVANTAGE - The method is rapid, improves drying efficiency of raw material, auxiliary materials and semifinished product, consumes less energy, and enables preparation of the fertilizer with excellent deodorization property.    DETAILED DESCRIPTION - Method for preparing organic fertilizer, involves (a) (i) stacking the raw materials and auxiliary materials on ground, mixing and spreading the materials, where the raw material comprises chicken manure and cow dung, and the auxiliary material comprises edible fungal residue and xylitol residue, (ii) drying the stretched raw materials and auxiliary materials naturally for 1-2 days by ditching, and (iii) drying the raw materials to water content of 40-50 wt.%, adding fermenting agent to the dried raw materials, stacking the mixture into strip-shaped pile having width of greater than or equal to 3 m and height of greater than or equal to 2 m, heating the mixture to 50-60 degrees C, and carrying out facultative aerobic pre-fermentation of the mixture for 5-30 days, (b) fermenting the pre-fermented mixture, (c) sampling the fermented product base on NY525-2002 standard, and detecting the qualified fermented product, (d) grinding and sieving the qualified semifinished product, and storing the product in storehouse, (e) reducing the water content of the product to 25-30 wt.%, piling the product, performing post-fermentation of the product, and preventing rainwater, (f) packaging and sealing the product, and stacking the sealed product, and (g) loading the packaged product on truck, and transporting the product to factory.