An ultrasonic mouth cleanser has a body, an atomizer module, a control module, a vibrating module and a recuperated module. The body has a casing and a brush. The atomizer module is mounted in the casing and has an ultrasonic shaker, a store chamber and a guiding channel. The control module is electrically connected to the atomizer module and has a signal converter, a CPU, an import unit and a display unit. The vibrating module is mounted in the casing, is electrically connected to the control module and has a controller, a driving motor a gear segment and an eccentric shaft. The recuperated module is mounted in the casing and has a recuperated pipe, a recuperated controller, a suction motor and a catch tank. The ultrasonic mouth cleanser in accordance with the utility model can be used safety to improve the cleaning effect to the user’s mouth.一種超音波口腔清潔器,設有一本體、一霧化模組、一控制模組、一顫動模組及一回收模組,該本體設有一主殼體及刷體,該霧化模組設於該主殼體內且設有一超音波震動器、一儲液槽及一導霧管,該控制模組與該霧化模組相電性連接並設有一訊號轉換器、一中央處理器、一輸入單元及一顯示單元,該顫動模組設於該主殼體內且與該控制模組相電性連接並設有一顫動控制器、一驅動馬達、一齒輪組及一偏心軸,該回收模組設於該主殼體內且設有一回收導管、一回收控制器、一抽水馬達及一集水槽,提供一可大幅提升清潔效果及安全使用的超音波口腔清潔器者。10‧‧‧本體11‧‧‧主殼體111‧‧‧容室12‧‧‧刷體13‧‧‧萬向接頭14‧‧‧柔毛刷15‧‧‧噴霧孔16‧‧‧回收孔17‧‧‧噴霧管18‧‧‧回收管20‧‧‧霧化模組21‧‧‧超音波震動器22‧‧‧儲液槽23‧‧‧加熱器24‧‧‧導霧管30‧‧‧控制模組33‧‧‧中央處理器34‧‧‧輸入單元35‧‧‧顯示單元40‧‧‧顫動模組41‧‧‧顫動控制器42‧‧‧驅動馬達43‧‧‧齒輪組44‧‧‧偏心軸50‧‧‧回收模組51‧‧‧回收導管52‧‧‧回收控制器53‧‧‧抽水馬達54‧‧‧集水槽