Method for producing soybean isoflavone by utilizing soybean molasses

The invention relates to a method for producing soybean isoflavone by utilizing soybean molasses. The method comprises the following step of extracting the soybean molasses through dilution, acid treatment, heat treatment, column chromatography, crystallization, drying and other processes, wherein the content of the obtained soybean isoflavone is more than 40 percent. The method has the benefits that as the soybean isoflavone is extracted by utilizing the soybean molasses as a by-product of an alcohol leaching soy protein concentrate, the added value of the soybean molasses is greatly increased; the method is suitable for industrial production.