Disclosed are an action execution apparatus and an ultrasound surgical instrument, wherein the action execution apparatus comprises: a first trigger assembly and a second trigger assembly, both of which can move, wherein the first trigger assembly comprises a first trigger (4) and the second trigger assembly comprises a second trigger (5), and during one part of the movement process of the first trigger (4) and/or the second trigger (5), the first trigger (4) and the second trigger (5) move independently from each other, a drive part (9) is connected to the first trigger assembly and the second trigger assembly respectively, and the first trigger assembly and the second trigger assembly respectively adapt to different mechanical advantages. The action execution apparatus can give more direct and precise feedback of the clamping force of a jaw through the second trigger assembly. In addition, the user can adjust the clamping force according to the practical situations of the tissue or blood vessel clamped, thereby increasing the application range of the ultrasound surgical instrument.
