NOVELTY - Preparation of acidic organic fertilizer by directional fermentation of organic waste, comprises preparing first combined liquid microorganism microbial inoculum by mixing Trichoderma, Nocardia and buffer solution. Preparing second combined liquid microorganism microbial inoculum by mixing liquid Aspergillus oryzae, liquid Mucor racemosus and buffer solution. Then adding first liquid microbial inoculum to organic waste for aerobic fermentation to form a middle fermentation product and adding the second liquid microbial inoculum for anaerobic fermentation.    USE - The method is useful for preparing acidic organic fertilizer by directional fermentation of organic waste.    ADVANTAGE - The organic fertilizer improves the alkaline land for planting acid crops, and it provides micro-ecological restoration of continuous cropping soil with low cost.    DETAILED DESCRIPTION - Preparation of acidic organic fertilizer by directional fermentation of organic waste, comprises: (i) mixing (each of one part by weight) liquid strains of Bacillus subtilis, Bacillus licheniformis, Bacillus pumilus, Saccharomyces cerevisiae, Acetobacter aceti, Trichoderma, Aspergillus oryzae, Mucor racemosus, Nocardia and Geotrichum candidum to obtain combined microorganism microbial inoculum raw liquid, then the combined microorganism microbial inoculum raw liquid is mixed with buffer solution of 5.3-5.8 pH according to 1:1-20 mass proportion to obtain first combined liquid microorganism microbial inoculum, which effectively contains bacteria not less than 2x 108 colony forming unit (CFU)/ml, or mixing solid powders of the above bacterial strains to obtain combined microorganism microbial inoculum raw powder, then the combined microorganism microbial inoculum raw powder is mixed with the powdered carrier according to 1:1-20 mass proportion to obtain first combined solid microorganism microbial inoculum, which effectively contains bacteria not less than 0.5x 108 CFU/ml; (ii) mixing ( in part by weight) liquid strains of Bacillus subtilis (2), Bacillus licheniformis (2), Saccharomyces cerevisiae (1), Bacillus coagulans (1), Lactobacillus acidophilus (1), Lactobacillus plantarum (1), Lactobacillus casei (1), Pediococcus pentosaceus (1), Aspergillus oryzae (1), liquid Mucor racemosus (1) and Nocardia (1) to obtain a second combined microorganism microbial inoculum raw liquid, then the second combined microorganism microbial inoculum raw liquid is mixed with buffer solution of 5.3-5.8 pH according to 1:1-20 mass proportion to obtain second combined liquid microorganism microbial inoculum, which effectively contains bacteria not less than 2x 108 CFU/ml, or mixing solid powders of above bacterial strains to obtain a second combined microorganism microbial inoculum raw powder, then the second combined microorganism microbial inoculum raw powder is mixed with the powdered carrier according to 1:1-20 mass proportion to obtain second combined solid microorganism microbial inoculum, which effectively contains bacteria not less than 0.5x 108 CFU/ml; (iii) adding first liquid combined microorganism microbial inoculum or the first solid combined microorganism microbial inoculum to organic waste (100) of 55-65 wt.% water ratio, the adding amount is 0.1-0.2% of the mixture mass for stacking as strips for aerobic fermentation in 7-10 days, and the stacks are turned over 2-3 times for oxygen supply during the period to form a middle fermentation product of 40-50 wt.% water ratio; (iv) adding the second liquid combined microorganism microbial inoculum or the second solid combined microorganism microbial inoculum to the middle fermentation product, the adding amount is 0.1-1 percent of the middle fermentation product mass, it is arranged in a sealing device for anaerobic fermentation in 25-30 degrees C for 5-10 days to obtain organic fertilizer of 6.0-6.5 pH value and 35-45 wt.% water ratio.