The invention relates to a preparation method of nameko nutriments. The nameko nutriments comprise the following components by weight percentage: 35-55 of rice bran, 25-45 of cotton seed hull, 10-16 of corncob, 1.5-2 of bean cake, 0.5-1 of wheat bran, 0.5-1 of corn flour, 0.5-1 of plaster, 1.5-2 of beanstalk, 0.1-0.3 of oxygen enriched powder, 0.1-0.3 of nitrogen-phosphorus-potassium compound fertilizer, 0.1-0.3 of carbendazol and 0.5-0.8 of calcium superphosphate. The preparation method of the nameko nutriments comprises the following steps: combining rice brans, cotton seed hulls, corncobs, bean cakes, wheat brans, corn flours and beanstalks together in proportion, pouring the mixture into a pulverizer, pulverizing the mixture into particles of about 80 meshes, taking out the particles, adding plaster, oxygen enriched powder, nitrogen-phosphorus-potassium compound fertilizer, carbendazol and calcium superphosphate in proportion, pouring the mixture into a stirrer, stirring the mixture for 35 minutes, adding water in the proportion of 1:1.1-1:1.3, uniformly stirring the mixture, stacking the mixture, fermenting for 6 hours and obtaining the qualified nameko nutriments.