A health functional food composition and a pharmaceutical composition for preventing or ameliorating a non-alcoholic fatty liver disease include an extract of Dolichos lablab Linne as an active ingredient. The extract of Dolichos lablab Linne, being an active ingredient, effectively reduces accumulation of triglyceride in hepatocarcinoma cell line (HepG2). Therefore, the compositions are used for functional foods and medicines for the prevention or amelioration of non-alcoholic fatty liver.