NOVELTY - Method for preparing green fertilizer, involves crushing animal excrement, corn straw and wheat bran, adding crushed components into a fermentation tank, then adding biological enzyme, organic fertilizer fermenting agent and then water to the tank, stirring, sealing and fermenting the mixture, adding potato powder to the tank, performing fermentation, adding common mineral soil, placing the fermentation product in shady place, drying the mixture, adding chitosan and magnesium sulfate, stirring and then allowing the mixture at static condition, and granulating the product.    USE - The method is useful for preparing green fertilizer (claimed).    ADVANTAGE - The method improves mineral content and nutrient content of the fertilizer, and provides enriched fertilizer with sufficient amino acids.    DETAILED DESCRIPTION - Method for preparing green fertilizer, involves (a) obtaining 10-30 wt.% animal excrement, 10-30 wt.% corn straw, 10-30 wt.% common mineral soil, 5-15 wt.% potato powder, 5-15 wt.% wheat bran, 1-5 wt.% chitosan, 1-3 wt.% magnesium sulfate, 1-3 wt.% salt, 1-3 wt.% biological enzyme and 1-3 wt.% organic fertilizer fermenting agent, (b) crushing the animal excrement, corn straw and wheat bran using crusher, (b) adding the crushed components into a fermentation tank, then adding biological enzyme and organic fertilizer fermenting agent to the fermentation tank, then adding water to the mixture in the tank, stirring the mixture for 10-15 minutes, sealing the mixture, and performing fermentation of the mixture for 1 week, (c) adding potato powder to the fermentation tank, and performing fermentation at 50 degrees C for 30 days, (d) adding common mineral soil to the mixture in the tank, (e) placing the fermentation product in shady place, and drying the mixture till the water content of the mixture is less than 8%, (f) adding chitosan and magnesium sulfate to the mixture, stirring the mixture for 20 minutes, and allowing the mixture at static condition for 24 hours, and (g) granulating the mixture using pelletizer to obtain product.