This portable welding carriage can realize various distances of welding, and the length and speed can be adjusted at will. The weld width is adjustable, the swing speed is adjustable, and five welding modes are optional. No manual care is required, and the efficiency is much higher than manual welding. Moreover, this portable welding carriage simulates manual welding rods, and the welds are beautiful and uniform, which can adapt to the welding of plates of various thicknesses.