The utility model discloses a skirt welding machine that shifts belongs to the auxiliary welding device field for the skirt welding of large -scale cylinder work piece, it includes organism, transmission shaft, angle adjustment gear, circulator, rotary power unit, tray, and the transmission shaft passes through angle adjustment gear to be connected with the circulator, and the circulator passes through back shaft and main gear connection, and rotary power unit is located the circulator, and passes through power gear and main gear drive, and the master gear passes through the back shaft to be connected with the tray, the tray is fixed with the welding dish, install a plurality of regulation poles on the welding dish, it has the regulation hole to open on the regulation pole, adjust the pole and pass the mounting that is fixed in on the welding dish, be equipped with the cassette at the tail end of adjusting the pole. In view of above -mentioned technical scheme, the utility model discloses can realize welding in succession through the change of large -scale cylinder weld workpiece self gesture, guarantee welded efficiency and quality, reduce workman's intensity of labour, reduce the safe risk that probably exists.