The application provides a shaping light pipe and a laser welding technology and relates to the technical field of laser welding. The light pipe with a lens is prepared by using a low price material such as a common transparent material; laser light emitted by a laser source is processed to form a welding light spot; a shape and energy of the welding light spot can meet requirements of the welding technology by adjusting parameters such as a distance and relative positions of the light pipe and the laser source as well as a welded article; further, the laser welding of the welded article is achieved; the light pipe is low in cost; the focused energy of the welding light spot is uniform; and while the technical cost of a manufacturer is lowered, the performance of the laser welding technology can be effectively improved.