NOVELTY - Preparing Bacillus licheniformis bio-fertilizer using yeast wastewater, comprising preprocessing the potassium-enriched yeast wastewater of biomass thermal power plant, preparing liquid seed by inoculating Bacillus licheniformis slant culture into preprocessed yeast wastewater, inoculating the resultant liquid seed into the fermenter containing preprocessed yeast wastewater and fermenting, uniformly mixing fermentation culture broth and organic fertilizer, drying by ventilation until the moisture content is less than 30%, packaging and then storing in cool dry place.    USE - The method is useful for preparing Bacillus licheniformis bio-fertilizer using yeast wastewater (claimed).    ADVANTAGE - The bio-fertilizer prevents plant diseases, promotes plant growth, is economical and simple to prepare, does not cause pollution, and suitable for tea plantation and vegetable plants.    DETAILED DESCRIPTION - Preparing Bacillus licheniformis bio-fertilizer using yeast wastewater, comprising: (i) preprocessing the potassium-enriched yeast wastewater of biomass thermal power plant by regulating pH to 7-8 and sterilizing at 110-121 degrees C for 10-30 minutes; (ii) preparing liquid seed by inoculating Bacillus licheniformis slant culture into preprocessed yeast wastewater taken in a conical flask and culturing at 25-37 degrees C for 24-36 hours under shaking condition of 120-200 rotations/minute; (iii) inoculating the resultant liquid seed (2-15 vol.%) into the fermenter containing preprocessed yeast wastewater, carrying out fermentation at 25-37 degrees C by passing sterile air for 15-36 hours to obtain culture broth having greater than or equal to 9x 108 CFU/ml viable cell count, where the fermentation culture broth can be used as liquid inoculant after dilution; and (iv) uniformly mixing fermentation culture broth and organic fertilizer (carrier) in a mass ratio of 1:3-1:10, drying by ventilation until the moisture content is less than 30%, packaging and then storing in cool dry place. An INDEPENDENT CLAIM is also included for use method of Bacillus licheniformis bio-fertilizer, comprising: (a) filtering the fermentation culture broth, diluting with water to obtain a viable cell count of 2x 106-5x 107 CFU/ml, uniformly mixing and administering 1-3 cm3 diluted solution/acre of soil near root cap during summer; and (b) then administering 0.5-3 tons biofertilizer as basal fertilizer/acre of soil or administering during growing period.