The humidifier adopts the evaporative humidification technology, which atomizes the water into fine water droplets instantaneously through the ultrasonic vibration of high-speed rotation, and rapidly diffuses into the room under the push of the fan to achieve the purpose of rapid humidification. Compared with the traditional gasification humidifier, this humidifier can not only keep the relative humidity constant, but also has a good energy conversion efficiency, power saving and environmental protection.