NOVELTY - Complex bio-fertilizer comprises 10-60 pts. wt. blanching liquid, 10-25 pts. wt. Azotobacter microbial inoculum, 10-25 pts. wt. Bacillus mucilaginosus microbial inoculum, 10-25 pts. wt. B.megatherium microbial inoculum, and 10-25 pts. wt. B.thuringiensis microbial inoculum, where the blanching liquid is prepared by pretreating industrial waste water produced during canning edible fungi.    USE - The complex bio-fertilizer in form of spray is useful for foliar, and soil fertility (all claimed), and preventing, and controlling insect.    ADVANTAGE - The complex bio-fertilizer is environmentally-friendly, simple to prepare, and suitable for industrial production, and long-term storage, contains no chemicals, and prevents soil hardening.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing complex bio-fertilizer, which involves (a) preparing blanching liquid by (i) collecting industrial waste water during the process of canning edible fungi, (ii) centrifuging the collected industrial waste water, and taking supernatant, (iii) placing the supernatant in falling film evaporator, and concentrating to a refractive index of 35-55% to obtain concentrated liquid, (iv) denaturing agent, denaturing the concentrated liquid, where the denaturing agent is 80-100% ethanol, and ethanol is added to the concentrated liquid in a volume ratio of 2:1-6:1, (v) filtering the concentrated liquid for removing denatured product, and collecting filtrate, (vi) recovering filtrate by rotary evaporation with ethanol, and (vii) filtering the recovered filtrate through 5-10K utilizing tangential flow filter membrane, and collecting filtrate, (b) preparing microbial inoculum by concentrating the concentrated liquid to 0.1-2% soluble solid, regulating pH of concentrated liquid to 5-8, and performing sterilization at 121-122 degrees C for 10-20 minutes, (c) inoculating 1-16% seed liquid in 250 ml triangular flask, where each triangular flask comprises 30-150 ml blanching liquid, and culturing at 24-40 degrees C for 24-96 hours until the viable cell count is 3-500000000/ml, and (d) preparing fertilizer by (i) sterilizing blanching liquid at 121-122 degrees C for 10-20 minutes, and uniformly mixing with microbial inoculum.