When the laser beam passes through optical components, diffraction and defocusing phenomena occur, which affect the optical signals of different parts to a certain extent, resulting in spatial nonlinear distortion and errors in long-distance laser ranging sensors. Therefore, a method for correcting errors in long-distance laser ranging sensors based on equidistant lines is proposed. Calculate distortion parameters using equidistant lines in a two-dimensional coordinate system to correct nonlinear distortion in long-distance laser ranging sensors. Based on the principle of laser scanning interference, the phase change is used to compensate for the phase of the ranging signal and correct measurement errors caused by target motion. Based on the linear relationship between inclination angle and error, construct a support vector machine regression model to predict and correct the inclination angle error of long-distance laser ranging sensors. The experimental results show that the PLCC and SROCC of the studied method reach 0.935 and 0.876, respectively, indicating good nonlinear distortion correction; After phase compensation correction, the spectral resolution is 12.56 mm, with a difference of only 0.06 mm; Compared to other comparison methods, the distance measurement results under multiple measurement points always approach the actual distance the closest.