Wide-angle lenses are generally used in photoelectric measurement systems with large fields of view, which will cause serious distortion problems in the obtained measurement images. In order to accurately calibrate this type of large-distortion camera, the radial distortion division model and the corner sub-pixel coordinate extraction method are used to first solve the image distortion center coordinates and distortion parameters. and then uses the two-dimensional plane checkerboard marker points and The corresponding relationship of the image points is used to solve the homography matrix, and then the internal and external parameters of the camera are further solved according to the homography matrix. After solving the relevant parameters, use the Levenberg-Marquardt method to iteratively optimize the solved parameters, and then based on the iterative optimization, the reprojection error data is eliminated according to the 3σ rule. Calibration is performed until all data meet the requirements, and finally high-precision correction of large-field-of-view distorted images can be achieved. In order to verify the effectiveness of the proposed method, calibration experiments on simulated images and actual images are carried out . The results show that this method can appropriately improve the calibration accuracy. In the actual experiment, the average mean square reprojection error is reduced by 0.0103 pixels, which is equivalent to improving the correction error accuracy by 0.7%.