The invention relates to a turret welding device for welding steel plates. The turret welding device for welding the steel plates comprises a base plate. Fixing blade plates are arranged on the lower side of the base plate. An installation plate is arranged in the middle of the base plate. A turret mechanism is arranged on the left portion. A left-right movement mechanism is arranged on the right portion of the base plate. First locating devices are arranged on the front and back sides of the base plate. Suction cups are arranged on the installation plate. A third locating device is arranged on the right side of the turret mechanism. A second locating device is arranged on the left side of the turret mechanism. The second locating device is matched with a clamping device arranged on the left portion of the installation plate. A clamping device matched with the first locating device is arranged at the left end of the left-right movement mechanism. The turret welding device for the welding steel plates aims to achieve the effects that the steel plates large in volume are fixed to the installation plate through the turret and the suction cups on the installation plate, the steel plates to be welded are located through the locating devices and clamped through the clamping devices, and then welding is conducted; and in this way, manpower is greatly saved, and the work effect is improved.