Abstract: Taking the 14 t continuous drive friction welding machine as the research object, a simplified model for finite element analysis was established and the static and dynamic characteristics of friction welder are analyzed. In the static characteristic analysis, the stiffness and strength of the whole machine under different working conditions such as self-weight state, friction processing stage, upsetting processing stage and cutting processing stage were checked, the weak position of the welder in the cutting state was found, which provided a theoretical reference for the development of the welding process parameters. In the study of dynamic characteristics, the first six natural frequencies of the whole machine are solved based on Block Lanczos feature extraction method, and all modes of the welder are described. After comparing with the critical speed, the safety of the friction welder in the whole machine design is verified. Based on the modal solution results, the harmonic response analysis of the friction welder was carried out, and the frequency response characteristics of the bed and the cutting system under the action of cutting force excitation were obtained.