The invention relates to a trimming knife welding machine which comprises a machine table, a first feeding device and a material moving device are arranged on one side of the machine table, a feeding device and a second feeding device are arranged on the other side of the machine table, a welding station is arranged between the feeding device and the second feeding device, a welding device is arranged below the welding station, and a mounting frame is arranged above the welding station. An angle detection device, a gluing device and a wire discharging device are arranged on the mounting frame, the material moving device comprises a shell and a three-axis moving mechanism, a fastening mechanism is arranged at one end of the shell, a rotating mechanism is arranged at the other end of the shell, the three-axis moving mechanism comprises a transverse moving assembly, a front-back moving assembly and a lifting moving assembly, and the shell is arranged on the rack. The rack is arranged on the lifting moving assembly, and a fixing mechanism is arranged at the end, corresponding to the fastening mechanism, of the rack. By the adoption of the technical scheme, positioning is more accurate, labor intensity is reduced, standardized production is achieved, the structure is simplified, steps are reduced, feeding is rapid, efficiency is improved, and the quality of finished products is high.