The invention relates to the technical field of mechanical equipment, and discloses a welding bench, a welding production line and a production method for a jack wheel carrier. The welding bench, the welding production line and the production method for the jack wheel carrier are characterized in that the welding bench comprises a working face, a welding clamp, a driving device and a supporting frame; the working face is provided with locating pins, and the positions of the locating pins correspond to those of threaded holes in a side frame; one end of the driving device is fixedly connected to the supporting frame, the other end of the driving device is connected with the welding clamp, a locating groove is formed in the end, facing the working face, of the welding clamp, the shape of the locating groove is matched with that of a workpiece wheel carrier to be welded, and limiting bolts are arranged on the outer edge of the locating groove. The welding bench enables the two welded ends to be maintained on the same horizontal plane in the clamp, welding is made to be flat and smooth, the welding clamp is long in service life, control is easy, the speed for replacing welded workpieces is high, clamping is firm, manual work is not needed, semi-automation is achieved, a welding robot is used for welding, quality is stable, and efficiency is high.