Abstract: In order to meet the monitoring requirements of cutting force in high-precision machining, a wireless force measuring tool holder for milling is designed in this paper, which uses piezoelectric film and elastic detection beam to collect force signals. In order to improve the sensitivity of the detection signal, the Nelder-Mead algorithm is used to optimize the structural parameters of the tool holder based on COMSOL Multiphysics software and the structural stiffness and dynamic characteristics of the tool holder are analyzed by finite element simulation. Finally, the milling comparison experiment is carried out to verify the feasibility of the design scheme. The results show that the force measuring tool holder designed and optimized in this paper has good sensitivity, and the dynamic and static characteristics of the tool holder meet the application requirements. Therefore, it is an effective cutting force monitoring scheme.