Clamping tool for body-in-white welding production line

The utility model discloses a body-in-white welding production line's clamping tool, including stroke lever, locating lever, neck, threaded pipe, casing pipe, electromagnet and sign board, said locating lever both ends both ends are inserted with stroke lever in sliding mode, the casing pipe is welded to both ends of stroke lever away from each other, the inside of casing pipe is inserted with threaded pipe in rotating mode, and the electromagnet is inserted into the threaded pipe. Electromagnets are arranged at the lower ends, penetrating through the sleeves, of the threaded pipes, power lines penetrating through the upper ends of the threaded pipes are connected to the upper surfaces of the electromagnets, symmetrically-distributed clamping grooves are welded to the lower surface of the positioning rod, identification plates are slidably inserted into the clamping grooves, and inserting pieces are arranged on the lower surfaces of the identification plates; second screw holes are formed in the two ends of t