The invention discloses a fixing device with a protective paint layer and a shock absorption function for a
welding plate. The fixing device comprises a bearing
chassis (61) and a cylindrical fixing component (62), wherein the bearing
chassis (61) is used for bearing a plate (29) to be welded, and the cylindrical fixing component (62) is fixedly connected with the bearing
chassis (61) and extends in the vertical direction. The cylindrical fixing component (62) comprises two fixing columns (681 and 682), a top wall portion (621) and a column root portion (622), wherein the two fixing columns (681 and 682) extend in the vertical direction and are opposite in the
diameter direction, the top wall portion (621) is fixedly connected with the upper ends of the two fixing columns (681 and 682), and the column root portion (622) is fixedly connected with the lower ends of the two fixing columns (681 and 682). Two locking sliding blocks (55 and 56) symmetrical about the center axis of the cylindrical fixing component (62) are arranged in an extensible channel (620) in a slidable mode, wherein the extensible channel (620) is arranged between the two fixing columns (681 and 682) and extends in the horizontal direction.