Positioning device for ship welding

The utility model relates to the technical field of ships, and discloses a positioning device for ship welding, which comprises a placing table, a mounting cavity is formed in the placing table, sliding chutes positioned on the left side and the right side of the mounting cavity are formed in the top of the placing table, and a driving assembly extending to the outside of the placing table is arranged in the placing table. And a positioning assembly connected with the driving assembly is arranged at the top of the placing table. According to the positioning device for ship welding, the driving assembly is arranged, a double-shaft servo motor is started to drive two driving screws to rotate, the driving screws drive driving blocks in threaded connection with the driving screws to move towards the side away from the double-shaft servo motor, and the driving blocks drive connecting shafts to move; and the connecting shaft drives the fixing rod to rotate around the joint of the supporting rod through the mounting