The invention discloses a workpiece fixing platform for mechanical processing, which comprises a support seat, at least four support rods are arranged at the lower end of the support seat, and an adjustment seat is installed on the lower end of the support rod through the fixing seat, and the lower end of the support seat A lifting device is provided, and the upper end of the lifting device is equipped with a support platform through a thrust bearing, and a ring gear is installed between the support platform and the support seat, which can meet various processing and positioning requirements of various workpieces, and realize the positioning of the workpiece. Universal fixation, and multiple devices of this type can be used to coordinately fix the same workpiece to achieve stable fixation of large-volume plates and rods, thereby avoiding the trouble of separately equipped with a dedicated fixing platform for each large-volume workpiece, and the device’s The location can be freely configured, so that it can be used in conjunction with different processing machines, which meets the deployment needs of different production lines and has high practical value.