The present invention relates to a method for manufacturing a porous red ginseng. The porous red ginseng according to the present invention forms a uniform porosity therein and thus obtains a crispy mouthfeel and an excellent flavor without an additional process such as an addition of fructose, etc., such that the resulting red ginseng may be not only directly eaten as an original form or slices of the red ginseng, but also have a very high content of ginsenoside and a low content of moisture therein, thus achieving a very excellent storage quality.