The present invention relates to a producing method of a red ginseng formulation with an increased compound K content, and a cosmetic composition for skin whitening, comprising a red ginseng formulation produced by a producing method of the present invention as an active ingredient. The present invention is to co-culture Cladosporium sp. and Leuconostoc citreum strains by inoculating both Cladosporium sp. and Leuconostoc citreum strains. The red ginseng extract with an increased ginsenoside content than an existing ginsenoside is produced by using the producing method of the present invention and, specifically, the extract has effects of enhancing anti-cancer, treating cancer, reducing cancer drug toxicity, preventing cancer and a thrombotic disease, and whitening, due to increasing the compound K in ginsenosides when using the method of the present invention.
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