This application describes a method for preparing a fermented red ginseng powder dispersion with improved dispersibility and ginsenoside content. The method includes (a) grinding red ginseng to obtain powdered red ginseng; (b) introducing the powdered red ginseng into a mixed liquid including β-Glucosidase to react with the powdered red ginseng; (c) inoculating the mixed liquid with a fermented strain for fermentation; and (d) controlling a concentration of the mixed liquid to a predetermined range.