The invention discloses a bus butt-joint tool, and the tool comprises a support part. The support part is provided with a connecting art which is detachably connected with a cylindrical flange, and a supporting part which is used for supporting a conductive rod in the cylinder. There is a concession distance, used for the insertion of a power supply connector outside the conductive rod, between the supporting part and the connecting part in the length direction of the conductive rod. The supporting part and the connecting part form the concession space which is used for the connection of the conductive rod with the electric connector, thereby solving the normal butt joint of the conductive rod and the electric connector. Meanwhile, the tool also can be taken out very easily after the butt joint of the tool, thereby improving the assembly efficiency, and reducing the cost.