The invention discloses an automatic word welding trolley which comprises a controller, a shell, a rack, a first motor, a first electronic push rod, a first electromagnet, a space cotton plate, a rubber plate, wheels, a second electronic push rod, a second electromagnet, a third electromagnet, a third electronic push rod, a first moving block, a first linear motor, a first sliding track, a first sliding block, a first cylinder, a second motor, screw nuts, a second cylinder, screw rods, a support rack, a third motor, a second sliding block, a second sliding track, a support rod, a rolling shaft, a roller, a belt, a support base, a fourth motor, a fifth motor, a first gear, a second gear, a wheel shaft, a welding gun, an inner cover, a second linear motor, a second moving block and an outer cover, wherein the first motor is mounted on the left side of the rack. The automatic word welding trolley has the advantages of being capable of moving and operating on the plane of a vertical steel plate.