A torque wrench for an ultrasonic scalpel, comprising a torque wrench body and a wrench rotor, wherein the torque wrench body comprises a circular-hole-shaped torque hole, with a torque clamping catch being provided in the torque hole, and wherein the wrench rotor is disposed in the torque hole and comprises a scalpel head clamping hole, a rotor clamping catch located outside the wrench rotor, and a scalpel head clamping slot located inside the scalpel head clamping hole; wherein the torque wrench is adapted to engage a wrench part disposed on a scalpel head of an ultrasonic scalpel by clamping the wrench part into the scalpel head clamping slot via the scalpel head clamping hole, and by engaging the rotor clamping catch with the torque clamping catch, wherein the torque hole has a cylindrical structure with a radius gradually expanding along an inserting direction of the ultrasonic scalpel, and the wrench rotor is disposed in a smaller diameter end portion of the torque hole; wherein the wrench rotor comprises a wrench part engagement portion and an expansion portion, with the length of the wrench part engagement portion along a central axis of the torque wrench body being substantially equal to the length of the wrench part, and the size of an inner hole of the expansion portion being larger than the size of an inner hole of the wrench part engagement portion; wherein an inner wall of the torque hole further comprises a plurality of limiting bulges, which are evenly distributed in the circumferential direction with the torque hole as the center, wherein the diameter of the largest circle formed by the plurality of limiting bulges is smaller than the diameter of a handle of the ultrasonic scalpel; and wherein an end face, away from the wrench rotor, of the limiting bulge and an end face, close to the limiting bulge, of the wrench part engagement portion of the wrench rotor are spaced apart by a first distance therebetween along the central axis of the torque wrench body; and an end face, close to the wrench part, of the handle of the ultrasonic scalpel and an end face, away from the handle, of the wrench part are spaced apart by a second distance along the central axis of the torque wrench body, the first distance is greater than the second distance, such that when an ultrasonic scalpel is inserted into the torque wrench in a direction from the end face, away from the wrench rotor, of the limiting bulge to the wrench part, the wrench part is prevented from reaching the inside of the wrench rotor. comprising a torque wrench body and a wrench rotor, wherein the torque wrench body comprises a circular-hole-shaped torque hole, with a torque clamping catch being provided in the torque hole, and wherein the wrench rotor is disposed in the torque hole and comprises a scalpel head clamping hole, a rotor clamping catch located outside the wrench rotor, and a scalpel head clamping slot located inside the scalpel head clamping hole; wherein the torque wrench is adapted to engage a wrench part disposed on a scalpel head of an ultrasonic scalpel by clamping the wrench part into the scalpel head clamping slot via the scalpel head clamping hole, and by engaging the rotor clamping catch with the torque clamping catch, wherein the torque hole has a cylindrical structure with a radius gradually expanding along an inserting direction of the ultrasonic scalpel, and the wrench rotor is disposed in a smaller diameter end portion of the torque hole; wherein the wrench rotor comprises a wrench part engagement portion and an expansion portion, with the length of the wrench part engagement portion along a central axis of the torque wrench body being substantially equal to the length of the wrench part, and the size of an inner hole of the expansion portion being larger than the size of an inner hole of the wrench part engagement portion; wherein an inner wall of the torque hole further comprises a plurality of limiting bulges, which are evenly distributed in the circumferential direction with the torque hole as the center, wherein the diameter of the largest circle formed by the plurality of limiting bulges is smaller than the diameter of a handle of the ultrasonic scalpel; and wherein an end face, away from the wrench rotor, of the limiting bulge and an end face, close to the limiting bulge, of the wrench part engagement portion of the wrench rotor are spaced apart by a first distance therebetween along the central axis of the torque wrench body; and an end face, close to the wrench part, of the handle of the ultrasonic scalpel and an end face, away from the handle, of the wrench part are spaced apart by a second distance along the central axis of the torque wrench body, the first distance is greater than the second distance, such that when an ultrasonic scalpel is inserted into the torque wrench in a direction from the end face, away from the wrench rotor, of the limiting bulge to the wrench part, the wrench part is prevented from reaching the inside of the wrench rotor.