Line laser welding seam automatic tracking system and method based on visual demonstration

The invention discloses a line laser welding seam automatic tracking system based on visual demonstration. The line laser welding seam automatic tracking system comprises a six-degree-of-freedom industrial robot, a robot control cabinet, a welding gun, a line laser visual sensor, a handheld demonstration device, an air cylinder, an industrial personal computer and a workbench. The invention further discloses a line laser welding seam automatic tracking method based on visual demonstration. The method comprises the steps that S1, before welding is started, a welding path and a welding gun posture are demonstrated in advance through the handheld demonstration device; S2, after welding is started, the line laser visual sensor continuously collects each frame of image and sends the images to the industrial personal computer, and feature extraction is carried out to obtain welding seam feature point coordinates and adjacent areas; and S3, the welding seam feature point coordinates are sent to the six-degree-of-fre