The present invention relates to a composition containing, as an active ingredient, an extract of soybean leaves (autumnal soybean leaves)of a specific stage, cultivated after soybean pods are removed therefrom at a specific stage during the growth stages of soybeans and, more particularly, to a cosmetic composition exhibiting excellent effects of anti-oxidation, anti-aging, skin damage inhibition, skin moisturization, skin whitening and the like by containing, as an active ingredient, an autumnal soybean leaf extract, which has improved anti-oxidation and anti-aging effects and can be obtained by cultivating soybean by removing soybean pods at stages R2 to R4, preferably at stages R3 to R4, during the growth stages of soybeans.