Vehicle body chassis welding fixture

The utility model belongs to the technical field of automobile chassis machining, and particularly relates to an automobile body chassis welding clamp which comprises a clamping platform, and a supporting assembly used for supporting a frame longitudinal beam and a guiding assembly used for transporting and guiding the frame longitudinal beam are arranged on the clamping platform. The guiding assemblies are arranged on the clamping platform in a sliding mode and can be in butt joint with the supporting assembly. The number of the guiding assemblies is two. The guide assembly comprises a rectangular tube and rollers, and a plurality of rollers are arranged on the rectangular tube at intervals; a plurality of turnover clamping mechanisms are arranged on the rectangular pipe at intervals, and the turnover clamping faces of the clamping mechanisms are arranged upwards and can be used for clamping a frame cross beam. The guide mechanism can be used for guiding the longitudinal beam and can also be used for support