A tool bit for an ultrasonic osteotome comprises a cutting portion at a front end of the tool bit, a bit body connected to a transducer and an arbor connecting the cutting portion and the bit body. The cutting portion is a long cylinder, a front end of which is shrunk, and a plurality of spiral cutting edges are formed on a side surface of the cylinder. When an operation is performed, the tool bit does not rotate, and thus will not cause damage to a body tissue such as pulling and tangling on the tissue. The tool bit can be accurately positioned, and there is no slippage and deviation on a bone surface, so that the cutting process is stable and smooth with high maneuverability. It integrates drilling and grinding functions in one body, realizing a multi-purpose scalpel, reducing operating time and fatigue of a doctor.
