The utility model relates to a multipurpose portable ultrasonic atomizer, belonging to the technical field of using ultrasonic vibration to atomized liquid. The utility model transfers the mechanical vibration energy generated by an ultrasonic transducer to the atomized liquid through dielectric liquid, an air chamber, and vibration diaphragm, having high atomizing efficiency. The utility model mainly comprises a high frequency circuit, the ultrasonic transducer 14, an atomizing cup 7, an airflow regulating cover 5, a blower fan 16, and a case. The atomizing cup used for containing the atomized liquid can be changed according to different atomized liquid, which is convenient for carrying. Output power can be changed for changing atomizing quantity through changing the working voltage of the high-frequency circuit.