Auxiliary tool for D-series high-speed train chassis welding

The invention provides an auxiliary tool for D-series high-speed train chassis welding. Two opposite supporting parts are arranged at one end of a main rod, so that a clearance is formed between the two supporting parts. A driving part is arranged in the clearance, the driving part can be driven by a driving device to move in the axial direction of the main rod, and the distance between the driving part and the two side faces, in butt joint, of the supporting parts is gradually increased in the direction away from the main rod. Therefore, when the driving part moves towards the main rod, the driving part can abut against the two supporting parts outwards, so that the ends, away from the clearance, of the supporting parts abut against the two side faces of plugs, and supporting force is provided for the two side faces of the plugs; and the two side faces of the plugs are closely attached to the open end of a floor, the assembling clearance between the plugs and the floor or the probability of misalignment gene