NOVELTY - Preparing liquid organic fertilizer, by adding bacterial liquid, nutrient substances and livestock excrement and/or plant or household domestic wastes, and subjecting mixture to fermentation process, where firstly aerobic fermentation is performed at 6.5-7.5 pH and 25-81 degrees C for 17-20 days and water is added to the mixture during the fermentation in an amount 5-10 times the total volume of the mixture, and further anaerobic fermentation is performed for 1-2 days.    USE - The method is useful for preparing liquid organic fertilizer used for improving soil fertility.    ADVANTAGE - The method enables preparation of fertilizer rich in bioactive substances and nutrition required for plants. The fertilizer increases number of soil microorganisms, improves plant yield and has low cost and wider application prospects. The method enables highly efficient utilization of waste into beneficial fertilizer.    DETAILED DESCRIPTION - Method for preparing liquid organic fertilizer, involves adding 0.1-1.5 wt.% bacterial liquid, 9-30 wt.% nutrient substances and 69-90 wt.% livestock excrement and/or plant or household domestic wastes, and subjecting mixture to fermentation process, where firstly aerobic fermentation is performed at 6.5-7.5 pH and 25-81 degrees C for 17-20 days and water is added to the mixture during the fermentation in an amount 5-10 times the total volume of the mixture, and further anaerobic fermentation is performed for 1-2 days. The nutrient substance is one or more chosen from rice bran, corn powder and wheat bran. The bacterial liquid comprises nitrogen-fixing bacteria, potassium solubilizing bacteria and antibiotic bacteria. The nitrogen-fixing bacteria is chosen from Rhizobium, A.chroococcum, Agrobacterium tumefaciens strain C58/PGV3850 strain, Hainan fast-growing rhizobia 166, Azospirillum strain Yu-62, Klebsiella planticola strain 19-1 and Azotobacter strain Az230. The potassium solubilizing bacteria is potassium silicate bacterium strain NBT, potassium solubilizing bacteria strain JF88 or potassium silicate bacteria G10 strain. The antibiotic bacteria is chosen from Streptomyces, Penicillium and Bacillus strain 5406. The bacterial liquid is prepared by selecting the above-mentioned nitrogen-fixing bacteria, potassium solubilizing bacteria and antibiotic bacteria, preparing culture medium having pH of 6-8.5, mixing the selected strains in a ratio of 1:1:0.025-0.05, canning, sterilizing and cooling the culture medium, inoculating mixed bacterial strain into sterilized culture medium and performing culturing process to obtain liquid strain. The fermentation culture medium comprises 93-97.8% fermentation broth, 2-6% acid or wine vinegar, 0.05-5% fresh bean sprouts, 0.05-0.5% fresh fruit juice and 0.1-0.8% bacteria liquid. The fermentation is performed at 6.5-7.5 pH and 20-65 degrees C for 24-30 hours.