The laser tube asymptotic bending correction is realized by the layer scanning. Based on the Perona-Malik edge extraction algorithm and the RANSAC linear feature extraction algorithm, the real-time online measurement of the laser asymptotic bending correction process is realized. The influences of process parameters on the pipe bending angles are analyzed. The results show that the bending angle nearly increases with time linearly. The position and shape parameters have little effect on the increasing rate of bending angles, while the axial feeding times are directly proportional to the variation of the single-layer bending angle. The curvature of the bending section can be changed by the axial feeding step length. The higher the average laser power, the faster the increasing rate of bending angles.