Abstract: A vacuum cleaner which is able to be used for water extraction cleaning and for dry suction cleaning. The cleaner comprises a dry suction cleaning device and a water extraction cleaning device which are movable individually under the connected condition thereof. The water extraction cleaning device includes an air-liquid separation surface such that air and liquid impinge against the air-liquid separation surface, thereby causing entrained liquid droplets to be separated from the incoming air, a second air-liquid separation surface disposed at downstream of the first separation surface such that air and liquid past the first separation surface impinge against the second air-liquid separation surface, thereby causing small droplets to be separated from air. The present vacuum cleaner perfectly prevents water from incoming toward a motor, that is a suction device and effectively cleans smooth flat floors as well as carpet, when used for water extraction cleaning.