NOVELTY - Culture medium is prepared by using porous stone powder, rare earth powder and mineral solution, where the mineral solution comprises 35-45 %mass of porous stone powder and rare earth powder.    USE - The culture medium is useful for producing microbial material which is used for transforming organic waste into biological organic fertilizer.    ADVANTAGE - The culture medium easily, cost-effectively and conveniently prepares microbial material in large scale with short fermentation time of 5-10 days compared with composting process, eliminates crushing of organic waste, and prepares biological organic fertilizer with high quality. The biological organic fertilizer improves crop yield, microbial flora in soil and taste of fruits, and does not reduce continuous cropping effect.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) method for preparing culture medium, involves mixing porous stone powder with rare earth powder, spraying mineral liquor on the mixture during heating and stirring process, uniformly blending the mixture, transferring the mixture into a sealed container, and incubating the mixture at 25-35 degrees C for 48-96 hours to obtain culture medium, where the heating temperature is controlled at 220-230 degrees C; (2) microbial material prepared by mixing medium, microbial flora, microbial activating material and mineral liquid in a mass ratio of 100:(1-3):(15-30):(80-120), where the microbial flora is chosen from aerobic bacterial flora, anaerobic bacterial flora, Actinomyces and filamentous fungi, and microbial activating material comprises (in %mass) dark brown sugar powder (4-8), soybean meal (4-6), rice bran (4-6), calcium (1-3), wood vinegar (0.3-1), activated carbon from rice husk (5-15), bamboo charcoal (0.3-1), broth (0.4-0.7), amino acid (0.4-0.7) and crab shell chitin (1.5-3); (3) method for preparing the microbial material, involves selecting culture medium, inoculating one microbial flora into selected medium, adding microbial activating material into the medium, spraying mineral liquid while stirring, culturing the medium in suitable growth condition for predetermined time, and obtaining mixed microbial material; and (4) microbial material for transforming organic wastes into biological organic fertilizer, by scattering or stirring the microbial material into organic wastes, fermenting the waste at 20-40 degrees C for 14-18 hours, and screening the fermented waste to 12-15 mm, where the upper portion of the screened material is residual material, bottom portion of the screened material is biological organic fertilizer, the microbial material and organic wastes are in a mass ratio of 2-5:100, and water content of organic wastes is 40-50%.