The utility model provides a car bumper welding set, is including being used for carrying out the welded welding machine to the bumper work piece, the number of fibers hole device of unhook trepanning on still including the PLC controller, be used for to measure the length measuring device that bumper work piece actual line feed pitch leaves and being used for detecting the bumper work piece, length measuring device and number of fibers hole device all set up in bumper work piece advancing direction's first top, the input of PLC controller passes through the wire with the output of length measuring device and number of fibers hole device respectively to be connected, and the controlled end of welding machine controller is connected through the wire to the output of PLC controller. The utility model discloses a carry out the automatic calibration function of solder joint position according to specific fabrication hole, guaranteed the uniqueness of solder joint position, under the prerequisite that can guarantee welding quality, improved the uniformity of car outward appearance.