Abstract: In order to carry out the experiment of damage detection and identification of beam mechanical parts based on sound signals, combined with the actual needs, a fixture device for beam mechanical parts was designed, and the use of the fixture device was explained in combination with the application examples. The clamping device upgrades the existing device, and designs a clamping block with different surface characteristics, so that it can quickly adapt to the clamping of mechanical parts of different cross-sectional shapes and different sizes, so as to achieve the purpose of high efficiency, multi-function and low cost. At the same time, the lead screw nut pair is adopted, which takes advantage of its simple structure and stable movement to realize the up and down movement and clamping of mechanical parts, which provides an effective experimental basis for structural damage detection and identification based on sound signal.