NOVELTY - Method for preparing citric acid fermented soybean molasses involves preparing culture medium by adding peeled potato to water, boiling and filtering the mixture, and adding glucose and agar, preparing seed culture medium by adding soybean molasses solution to the glucose solution, and cooling the mixture, preparing fermentation culture medium, activating the strain by inoculating the Aspergillus niger strain in the above-prepared seed culture medium, adding the seed cultured liquid to fermentation culture medium and performing citric acid fermentation.    USE - The method is useful for preparing citric acid fermented soybean molasses (claimed).    ADVANTAGE - The method enables to prepare product environmentally-friendly, and cost-effectively with improved waste utilization value.    DETAILED DESCRIPTION - Method for preparing citric acid fermented soybean molasses involves preparing culture medium by adding peeled potato to water, boiling the mixture for 25-35 minutes, filtering the boiled mixture and adding 0.1-0.15 g glucose and 0.09-0.095 g agar in a ratio of 4.8:5.2, preparing seed culture medium by adding 55-65 g/l soybean molasses solution to 1 ml glucose solution containing 0.05-0.06 g glucose in volume a ratio of 1:1.9-2.1, and cooling the mixture, preparing fermentation culture medium by adjusting the sugar mass concentration of the soybean molasses solution to 23-28%, and adding lime to adjust the pH to 8.8-9.2, heating and filtering the mixture, adjusting the pH of the filtrate to 5.8-6.2, and adding oxalic acid to remove residues of calcium, performing centrifugation at 2500-3500 revolutions/minute, adding urea and potassium dihydrogen phosphate to the supernatant, adjusting the pH of the mixture to 4.3-4.8 using hydrochloric acid or sodium hydroxide solution, and cooling the mixture, activating the strain by inoculating the Aspergillus niger strain in the above-prepared culture medium, and culturing at 28-33 degrees C for 65-80 hours, washing the spore suspension using sterile water, inoculating the spore suspension in seed culture medium, performing culturing at 32-38 degrees C and 150-250 r/min for 35-45 hours, adding the seed cultured liquid to fermentation culture medium and performing citric acid fermentation at 32-38 degrees C, and 150-250 r/min for 90-100 hours.