The invention belongs to the technical field of electric engineering, in particular to a welding machine, which comprises a base; the base is connected to a cross arm by a support column, a welding space is formed between the cross arm and the base, the cross arm is horizontally and slidably connected to a welding head seat, the lower end surface of the welding head seat is provided with a plurality of laser welding heads, the welding head seat can be connected to a horizontal driving cylinder capable of driving the welding head seat to move horizontally, the support column and the cross ram are slidably connected longitudinally, the cross arm can be connected to a longitudinal driving cylinder capable of driving the cross arm to move longitudinally, the welding machine is characterized in that a positioning frame is disposed between the cross arm and the base in a suspending manner and is provided with a hollow opening, a rotary ball for placing welded workpieces is arranged in the hollow opening and the rotary ball is rotatably connected to the positioning frame. The welding machine is characterized in that machining time is saved, thus welding efficiency is improved, manpower is saved and the production cost is reduced.