The present invention relates to a method for preparing a red ginseng preparation having increased compoud K content and a cosmetic composition for skin whitening comprising the red ginseng preparation prepared by the production method of the present invention as an active ingredient, Inoculated with a strain of Escherichia coli. The method of the present invention can produce an increased amount of red ginseng extract than the known ginsenoside content. In particular, the method of the present invention can increase the compound K among ginsenosides, , Cancer treatment, reduction of anticancer drug toxicity, prevention of cancer, prevention of thrombosis, and whitening effect.
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