NOVELTY - Preparing gamma polyglutamic acid containing organic fertilizer comprises e.g. mixing potato dextrose agar (PDA) slant medium with activated Bacillus subtilis natto, mixing e.g. glucose, corn starch, yeast powder, sterilizing to obtain liquid culture medium, activating, stirring in a shake flask to obtain Bacillus subtilis natto fermented liquid, adding fermented liquid into the fermentation tank containing culture medium, obtaining Bacillus subtilis natto fermentation broth, carrying out stacking fermentation, obtaining fermented organic matter.    USE - The method is useful for preparing gamma -polyglutamic acid containing organic fertilizer (claimed).    ADVANTAGE - The method produces product having good loose ventilation characteristics, and has good yield.    DETAILED DESCRIPTION - Preparing gamma -polyglutamic acid containing organic fertilizer comprises (i) preparing fermentation broth of activated Bacillus subtilis natto: (a) mixing potato dextrose agar (PDA) slant medium with the activated Bacillus subtilis natto, (b) mixing 10 pts. wt. glucose, 5 pts. wt. corn starch, 4 pts. wt. peptone, 5 pts. wt. yeast powder, 1 pts. wt. magnesium sulfate, 2 pts. wt. sodium chloride, 1000 pts. wt. water, and sterilizing under pressure of 0.11 MPa pressure for 30 minutes to obtain liquid culture medium, activating liquid culture medium of Bacillus subtilis natto at 28-30 degrees C, and stirring in a shake flask at 180 revolutions/minute for 20-24 hours to obtain Bacillus subtilis natto fermented liquid having live bacteria of 1x 108 to 5x 108 cells/g, (c) adding Bacillus subtilis natto fermented liquid into the fermentation tank containing culture medium, where the culture medium includes 100 pts. wt. potato, 8 pts. wt. glucose, 50 pts. wt. soybean flour, 1 pts. wt. sodium chloride, 1000 pts. wt. water, and incubating at 30-35 degrees C for 28-32 hours to obtain Bacillus subtilis natto fermentation broth, (ii) carrying out stacking fermentation by mixing 300-500 pts. wt. edible fungus culture waste material slag, 200-300 pts. wt. crushed crop residues, 300-400 pts. wt. furfural residue for 30-40 days, and drying to obtain fermented organic matter, (iii) mixing 300-500 pts. wt. monosodium glutamate plant hydrolysis residue in 500-700 pts. wt. step (ii) fermented organic matter to obtain mixture, and mixing 150-250 pts. wt. step (i) Bacillus subtilis natto fermentation broth with 50-150 pts. wt. mixture, and adjusting the water content to 50-60 wt.%, and carrying out fermentation at 28-35 degrees C for 25-40 hours, and drying to obtain the final product.