This invention is for the compound containing ginsenoside Rg3 as an active ingredient to prevent and treat Hepatitis C virus infection. Specifically, the ginsenoside Rg3 of this invention demonstrated the predominant antiviral activities and apotosis actions in a dose-dependent manner in the Hepatitis C virus infected cells (Huh 7.5.1). Confirmed that it reduces the levels of TNF-α and thioredoxin significantly, and increases phospho-NFκB. It also demonstrated same effectiveness as PegInterferone alpha-2b(PegIFN a-2b, Hepatitis C therapeutics), and has no cytotoxicity to human bodies. Thus, it may be used safely as an active ingredient of medical/pharmaceutical and health food compounds for preventing or treating Hepatitis C.