The present invention provides a humidifier and a method for controlling the humidifier, and relates to a new technology that uses ultraviolet rays to reduce the risk of infectious diseases caused by the humidifier. The humidifier (10) includes: a water supply tank (12)； a processing chamber (14), which is arranged below the water supply tank and performs ultraviolet sterilization treatment on the water (W) supplied from the water supply tank； and an ultraviolet irradiation unit (16 ), is set in the treatment chamber (14) and irradiated with ultraviolet rays； the atomization chamber (18) is supplied with water W'after being sterilized by ultraviolet rays in the treatment chamber (14)； atomizer (20), The system is set in the atomization chamber (18) to atomize the water； the path (22) is for spraying the atomized water to the outside； and the control mechanism is for the water supply tank (12) through the treatment chamber ( 14) The flow of water supplied to the atomization chamber (18) is controlled.本發明提供一種加濕器及加濕器的控制方法，關於用紫外線來降低由加濕器導致的傳染病等風險的新技術。加濕器(10)包括：供水箱(12)；處理室(14)，係被配置在供水箱的下方，對從該供水箱供給的水(W)進行紫外線殺菌處理；紫外線照射部(16)，係被設置於處理室(14)，並照射紫外線；霧化室(18)，係被供給在處理室(14)中被紫外線殺菌處理後的水W'；霧化器(20)，係被設置於霧化室(18)，對水進行霧化；路徑(22)，係供被霧化的水噴向外部；以及控制機構，係對被從供水箱(12)經處理室(14)供給到霧化室(18)的水的流動進行控制。
