The purpose of the present invention is to provide a composition which is effective in alleviating, preventing, or treating diabetes using a natural extract without side effects of toxicity. To this end, the present invention provides a composition for alleviating, preventing, or treating diabetes, which can be safely used without toxicity containing a Smilax china L. leaf fraction. According to the present invention, the Smilax china L. leaf fraction is highly effective in inhibiting &alpha；-glucosidase and has excellent antidiabatic effect, thereby providing a food composition for alleviating diabetes. 본 발명은 항당뇨 조성물에 관한 것으로, 청미래덩굴잎 분획물을 유효성분으로 함유하여, 독성이 없어 안전하게 사용될 수 있는 당뇨 개선, 예방 또는 치료용 조성물을 제공한다.
