NOVELTY - Preparing fertilizer comprises mixing e.g. rotten apple, mixing with e.g. sheep manure, carrying out closed fermentation to obtain first fermented material, adding e.g. radix stemonae, mixing, adding water, decocting, filtering to obtain traditional Chinese medicine aqueous extract, which is added into the first fermented material, adding e.g. soybean cake, carrying out second closed fermentation to obtain second fermented material, adding e.g. zinc sulfate, mixing, grinding into powder, and mixing the second fermented material with traditional Chinese medicine aqueous extract.    USE - The method is useful in preparing fertilizer for corn (claimed).    ADVANTAGE - The fertilizer improves lodging resistance, diseases resistance and drought resistance. The corn exhibits high absorption rate. The method utilizes closed fermentation, thus the nutrient content of the fertilizer is enriched, cost is reduced, and waste is turned into the treasure.    DETAILED DESCRIPTION - Preparing fertilizer comprises (i) taking 4-5 pts. wt. rotten apple, 10-15 pts. wt. rotten orange and 22-25 pts. wt. tangerine, and uniformly mixing the chopped pulp to obtain rotten fruit pulp for further use, (ii) taking rotten fruit pulp and 30-35 pts. wt. sheep manure, 35-40 pts. wt. peat soil, 2-4 pts. wt. brown sugar, 20-25 pts. wt. wheat flour, 10-15 pts. wt. bran, 10-15 pts. wt. straw and 1-2 pts. wt. activated sludge, mixing, carrying out closed fermentation for 14-16 days to obtain first fermented material, (iii) adding 4-8 pts. wt. radix stemonae, 4-8 pts. wt. unbracteolated spurge root, 2-4 pts. wt. radix sophorae flavescentis and 3-5 pts. wt. towel gourd flower, uniformly mixing, adding water (5-8 times), decocting for 4-8 hours, filtering to obtain traditional Chinese medicine aqueous extract for further use, drying the filtered dregs of a decoction, and grinding to obtain medicine slag for further use, (iv) adding traditional Chinese medicine residue powder into the first fermented material, adding 5-1 pts. wt. ectomycorrhizal (EM) microbial inoculum, 10-20 pts. wt. tea leaf, 10-20 pts. wt. rapeseed cake, 10-15 pts. wt. soybean cake and 4-8 pts. wt. medical stone powder, carrying out second closed fermentation for 8-10 days to obtain second fermented material, and (v) adding 8-10 pts. wt. urea, 35-38 pts. wt. diammonium phosphate, 38-40 pts. wt. potassium chloride and 1-2 pts. wt. zinc sulfate, mixing uniformly, grinding into powder, and mixing the second fermented material with traditional Chinese medicine aqueous extract to obtain the finished product.