Coaxial adjusting device, laser processing equipment and coaxial adjusting method

The invention relates to a coaxial adjusting device, laser processing equipment and a coaxial adjusting method. The coaxial adjusting device comprises an adjusting reference piece and a lens mounting base, the adjusting reference piece is provided with a through hole, and the edge of the through hole is provided with a first scale line extending in the third direction and a second scale line extending in the second direction; adjusting reference pieces are arranged at the two ends of the lens mounting base at intervals. The lens mounting base is used for mounting a lens group, and the outer wall of the lens group is provided with a third scale line and a fourth scale line which extend in the axial direction of the lens group and are spaced in the circumferential direction. The angles of the lens group relative to the adjusting reference pieces are adjusted by taking the scale marks of the adjusting reference pieces on the two sides as a benchmark, so that the scale marks of the lens group and the scale marks