NOVELTY - Biological organic fertilizer comprises (in parts weight): decomposed organic substance (65-85), Trichoderma microbial agent (5-15) and Actinomycetes fermented liquor (5-15). The decomposed organic substance is obtained by adding micro-organic fermented microbial inoculum (1-2) to furfural residue (45-65), tobacco residue (20-35) and weathered coal (8-20), stacking the materials, fermenting the mixture and airing the fermented mixture until the moisture content is 25-35 wt.%.    USE - The biological organic fertilizer is useful for preventing disease.    ADVANTAGE - The organic fertilizer is cost-effective and does not cause environmental-pollution.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing the fertilizer, which involves (a) uniformly mixing furfural residue, tobacco residue and weathered coal with micro-organic fermented microbial inoculum, adjusting moisture content of the mixture to 58-70 wt.%, mass ratio of carbon/nitrogen to 23-28 and pH to 7-7.5, piling the mixed material on trapezium oil to a height of 1.5-2 m, drilling hole 8-15 holes/square from top to bottom, covering the holes with plastic film, aerobically fermenting the mixture for 3-5 days after temperature of the pile is raised to 50 degrees C, turning and fermenting the mixture for 2-3 days, airing the fermented organic fertilizer such that the moisture content is 25-35 wt.%, and maintaining the mixture, (b) uniformly mixing (in parts weight): seed husk (90-95), monopotassium phosphate (1-2), calcium superphosphate (2-4) and magnesium chloride (1-2) with water (120-140), regulating pH of the mixture to 6.5-7.5, sterilizing the mixture at high pressure of 0.12-0.15 MPa, maintaining the mixture for 3-4 hours, culturing Trichoderma strain on potato dextrose agar (PDA) slope culture medium for 2 days, transferring the culture to potato dextrose liquid culture medium and culturing for 2-3 days at 28 degrees C in presence of vibration, introducing the inoculum (2-5 wt.%) on sterilized cotton seed husk and culturing for 5-10 days at 28 degrees C to obtain Trichoderma microbial agent, where the living bacterial exponent is 1x 1010 piece/g or more, (c) culturing Actinomycetes on slope culture medium to obtain Actinomycetes fermented liquor, where the living bacteria exponent is 1x 8 piece/ml of more, and (d) uniformly mixing decomposed organic substance, Trichoderma microbial agent and Actinomycetes fermentation liquor, and airing the mixture at normal temperature until the moisture content is 20-22 wt.% to obtain biological organic fertilizer.