The utility model discloses an ultrasonic oil drum-cleaning device which comprises an ultrasonic system, a wash tank and a bracing frame, wherein the ultrasonic system comprises a supersonic generator power source, a connecting line and an ultrasonic transducer, the supersonic generator power source is connected with the ultrasonic transducer through a connecting line. By the vibration of the ultrasonic transducer, a great amount of air and air bubble is produced in the liquid, the air and air bubble compresses, expands and mutually collides, thereby producing a large amount of strong pressure peak which makes the air bubble explode and removes greasy dirt and rust spot from the work piece surface, and achieving cleaning purpose. At least one group of the ultrasonic transducer of the ultrasonic system is installed in the wash tank. The bracing frame comprises a bottom bracket and an oil drum guide frame. The utility model has the advantages of convenient operation, safety, effectiveness and flexible assembly and disassembly.