NOVELTY - Preparing fertilizer involves drying and crushing mushroom, oyster shell, freshwater pearl, horseshoe mushroom, Humulus japonicus and Corchorus to obtain respective powders, mixing vinegar and drinking water, mixing the above-mentioned powders except Corchorus powder, mixing mixed powder with mixture of vinegar and water, subjecting mixture to fermentation, mixing mixture with Corchorus powder, mixing mixture and drinking water, heating, cooling and filtering mixture, and mixing mixture and drinking water to obtain fertilizer.    USE - The method is useful for preparing fertilizer preferably liquid or solid fertilizer used for producing agricultural products which is used for preparing processed foodstuffs (all claimed).    ADVANTAGE - The method enables preparation of high quality and environmentally-friendly fertilizer using natural materials.    DETAILED DESCRIPTION - Method for preparing fertilizer, involves (a) drying mushroom to obtain dried mushroom having moisture content of 5% or less, and crushing the dried mushroom into size of 1-20 mu m, (b) drying oyster shell to obtain dried oyster shell having moisture content of 5% or less, and crushing the dried oyster shell into size of 1-10 mu m, (c) drying freshwater pearl to obtain dried freshwater pearl having moisture content of 5% or less, and crushing the dried freshwater pearl into size of 1-50 nm, (d) drying horseshoe mushroom to obtain dried horseshoe mushroom having moisture content of 5% or less, and crushing the dried horseshoe mushroom into size of 1-20 mu m, (e) drying Humulus japonicus to obtain dried H.japonicus having moisture content of 5% or less, and crushing the dried H.japonicus into size of 1-20 mu m, (f) drying Corchorus to obtain dried Corchorus having moisture content of 5% or less, and crushing the dried Corchorus into size of 1-10 mu m, (g) mixing 20% vinegar and drinking water in a weight ratio of 10-30:70-90, (h) mixing obtained mushroom powder, oyster shell powder, freshwater pearl powder, horseshoe mushroom powder, and H.japonicus powder in a volume ratio of 30-90:5-50:1-50:20-80:10-50 to obtain mixed powder, (i) mixing the mixed powder with mixture of vinegar and water in a volume ratio of 1:1-1:10, (j) subjecting obtained mixture to fermentation at 25-50 degrees C for 5-7 days, (k) mixing the mixture with the Corchorus powder in weight ratio of 100:1-100:5, (l) mixing mixture obtained in the step (k) and drinking water in a weight ratio of 1:1-1:5, and heating obtained mixture at 90-100 degrees C for 2-5 hours, (m) cooling the mixture to 1-5 degrees C and filtering cooled mixture, and (n) mixing mixture obtained in the step (m) and drinking water in a mass ratio of 1:200-1:3000 to obtain fertilizer. INDEPENDENT CLAIMS are included for the following:    (1) liquid fertilizer obtained by the above-mentioned method;    (2) solid fertilizer obtained by drying the mixture obtained in the above-mentioned step (k);    (3) agricultural products produced using the above-mentioned fertilizer; and    (4) processed foodstuff obtained by processing the above-mentioned agricultural products.