Abstract: An ultrasonic humidifier may include a water tank, an atomizer arranged in the water tank, an upper cover detachably connected with the water tank and an artificial flower, wherein the upper cover is provided with a mist outlet pipeline, and a branch of the artificial flower is inserted from the mist outlet pipeline; and a user can change different varieties and styles of artificial flowers according to current mood. Different colors and styles of artificial flowers have different impacts on visual sense every time, which is not easy to generate visual fatigue. Moreover, mist is directly sprayed from the branch of the artificial flower, and the artificial flower becomes beautiful and elegant visually. When aromatic oil matched with the artificial flower is added into water, smell sense and visual sense of the user are capable of being perfectly unified.