Provided is a method for efficiently producing an exceptionally water-soluble polyphenol composition containing a large quantity of poorly-water-soluble polyphenol. A method for producing a polyphenol composition, comprising (1) a step for heat-treating a poorly water-soluble polyphenol (A) and a protein (B) at 100-180°C in the presence of an aqueous medium； and (2) a step for spray-drying or freeze-drying the treated solution within 300 minutes after the heat treatment has concluded.
