An ultrasonic scalpel bit is disclosed comprising a bit tip (1), a bit bar (2) and a bit body (3), with one end of the bit bar (2) being connected to the bit tip (1), and the other end of the bit bar (2) being connected to the bit body (3). A main body of the bit tip (1) is of a cylindrical structure, a front end of which is tapered. A single or a plurality of spiral bit blades (11) are spirally arranged along the bit tip (1) from the foremost end of the bit tip (1) to form a cutting portion. A cutting blade (12) of the spiral bit blade (11) is of a square or sharp blade structure. The spiral design of the bit tip (1) may assist a surgeon to gradually drill a hole inwardly in a spiral manner in surgery where it is necessary to use an ultrasonic scalpel to drill the hole. This way the drilling operation will be more controllable, thereby improving the safety of the surgery, and reducing the operation intensity of the surgeon. Fig. 2 for publication Fig. 1 31, Fig. 2
