The invention relates to a welding tool for conductive tube welding. The welding tool for conductive tube welding comprises a positioning base. A wiring seat positioning structure and a conductive tube positioning structure are arranged on the positioning base. The wiring seat positioning structure comprises a positioning support and a positioning shaft used for installed in a positioning hole of a wiring seat in a penetrating mode. The positioning support is fixed to the positioning base. The positioning support is provided with a positioning surface and an installation hole, wherein the positioning surface is used for blocking the wiring seat in the axial direction of the positioning hole, and the installation hole is used for fixedly installing the positioning shaft. An L-shaped positioning space is defined by the positioning surface of the positioning support and the positioning base. The axis of the positioning hole in the wiring seat is parallel to a butt joint surface, and the accuracy requirement between the axis of the positioning hole and the butt joint surface is high. The positioning shaft is installed in the positioning hole in the penetrating mode and fixed to the positioning support, and thus the wiring seat can be positioned. A conductive tube can be positioned through the conductive tube positioning structure, the butt joint position of the wiring seat and the conductive tube is guaranteed, welding deformation and dislocation caused by part and component movement in the welding process are avoided, and the welding accuracy is high.