Positioning structure for sheet metal part welding

The utility model relates to the technical field of sheet metal part welding, and discloses a positioning structure for sheet metal part welding, which comprises a workbench and a vertical rod. According to the positioning structure for sheet metal part welding, by pressing an adjusting plate, a first swing plate drives a lifting rod to move upwards, the first swing plate moves upwards to enable a second swing plate to lift a fixed pressing plate, and at the moment, a to-be-welded sheet metal part can be placed at the bottom of the fixed pressing plate and located in the middle of two fixed side plates; a servo motor is started to drive a first gear and a second gear to rotate at the same time, the first gear and the second gear are engaged with a second annular rack and a first annular rack correspondingly, so that a first connecting rod and a second connecting rod drive two fixing side plates to get close to each other to fix the front side and the rear side of a to-be-welded sheet metal part, and an adjust