A method for calibrating an airborne three-linear array CCD camera features that a sectional calibration model of airborne linear array CCD camera and a cyclic two-step calibration method are adoptedto calibrate the three-linear array CCD camera, so the positioning accuracy of the three-linear array CCD camera is greatly improved, the geometric error of the camera is reduced and the universalityis strong. Based on the CAM calibration file, a small number of control points are used to adjust the regional network, and the error factors in the original POS observation data can be effectively eliminated, so that the positioning accuracy is further improved.