Workpiece fixing tool and welding production line

The utility model provides a workpiece fixing tool which is used for fixing a special-shaped workpiece and is matched with a displacement device to be fixed on the displacement device, the workpiece fixing tool comprises a base and auxiliary supports, the auxiliary supports are arranged on the periphery of the base, each auxiliary support comprises a connecting piece and a supporting piece, and the connecting pieces are connected with the supporting pieces. The supporting piece is at least provided with a first positioning hole and a second positioning hole in the direction of the base, a positioning pin and a fixing device are arranged on the upper end face of the base, the fixing device is detachably arranged on the base, and a clamping piece is arranged on the lower end face of the base. The utility model further provides a welding production line which is used for transferring the fixing tool so as to weld a workpiece fixed by the fixing tool and comprises a feeding frame, a position changing device, a we