The present invention relates to a method for preparing an extract of Hovenia dulcis effective in metabolizing alcohol and relieving a hangover and health functional foods containing the extract. The present invention provides a method for preparing an extract of Hovenia dulcis comprising: (a) a step for obtaining a first extract by grinding the xylem, fruits, and leaves of Hovenia dulcis separately, putting the xylems, fruits and leaves in 75% ethanol each, extracting for 24-72 hours, filtering the respective extracts, and then drying the filtered extracts (b) a step for obtaining the fraction from the extracts of step (a) by the part and solvent through following steps (i) and (ii) (i) a step for dissolving the extract from step (a) in 80-100°C hot water and eliminating insoluble substances, and then drying the hot water fraction of the xylem (ii) a step for obtaining a leaf butanol fraction, a fruit butanol fraction, a xylem ethylacetate fraction, and a xylem water fraction by dissolving the extracts from step (a) in water and then sequentially separating fractions using hexane, petroleum ether, chloroform, ethylacetate, N-butanol, and water as solvents, and then removing the solvents by concentrating the fractions and (c) a step for drying the fraction selected from the group consisting of the xylem hot water fraction, leaf butanol fraction, the fruit butanol fraction, the xylem ethylacetate fraction, and the xylem water fraction obtained from step (b) and then mixing the dried fractions, and health functional foods containing the extracts of Hovenia dulcis obtained by the method as active ingredients.COPYRIGHT KIPO 2015본 발명은 알코올 분해 효능과 숙취해소가 우수한 헛개나무 추출방법 및 이의 추출물을 함유한 건강기능식품에 관한 것으로, (a) 헛개나무 목질부, 열매 및 잎을 각각 분쇄한 후 75% 에탄올에 넣고 24 내지 72 시간 동안 추출하고 여과한 다음, 상기 여과액을 건조하여 1차 추출물을 수득하는 단계 (b) 상기 (a)의 추출물로부터 하기 (ⅰ) 및 (ⅱ)의 단계를 통해 부위 및 용매별 분획물을 수득하는 단계 및 (ⅰ) 상기 (a)의 추출물을 80~100℃의 열수로 용해시켜 불용성 물질은 제거하여 목질부 열수 분획물을 건조하는 단계 (ⅱ) 상기 (a)의 추출물을 물로 용해시킨 후 헥산, 페트롤레움 에테르, 클로르포
