An ultrasonic bone scalpel bit, comprising a scalpel body (1), a scalpel rod (2), and a scalpel bit tip (3). One end of the scalpel rod (2) is connected to the scalpel bit tip (3), and the other end of the scalpel rod (2) is connected to the scalpel body (1). The cross section of the scalpel bit tip (3) is of a polygonal cylindrical structure or an approximate cylindrical structure, and the scalpel bit tip (2) has at least two cutting surfaces with different cutting widths. The scalpel bit is provided with a liquid flow hole (41)； the scalpel bit tip (3) is provided with a knurled structure； the knurled structure extends from the frontmost end surface of the scalpel bit tip (3) towards the direction of the scalpel rod (2) so as to form a file-shaped scalpel bit. The ultrasonic bone scalpel bit not only meets the requirement of a doctor for the accuracy of bone cutting width, but also saves the time required to replace scalpel bits with different widths, thereby improving the surgical efficiency.
