Provided is a humidification and air cleaning apparatus. The humidification and air cleaning apparatus includes: a base body including an intake flow passage formed at a lower side thereof, including a clean connection flow passage formed at an upper side thereof, and discharging air entered through the intake flow passage into the clean connection flow passage; a water tank storing water, disposed at an upper side of the base body, and separable from the base body; and a humidification connection flow passage formed outside the water tank and guiding external air of the water tank to the inside of the water tank. Here, when the water tank is placed on the base body, the humidification connection flow passage and the clean connection flow passage communicate with each other.