Alignment calibration method and system for 3D measuring device and computer readable storage medium

The invention provides an alignment calibration method and system for a 3D measuring device and a computer readable storage medium. The method is applied to a 3D measuring device comprising at least one automatic focusing module and an imaging module and comprises the steps of: calibrating a lens of the automatic focusing module, and obtaining a calibration result; acquiring a first motion displacement value and a motion inclination value of the lens of the automatic focusing module at a plurality of preset distances according to the calibration result; constructing a polynomial fitting function, fitting the optical center deviation value of the lens obtained according to the motion inclination value with the first motion displacement value, determining the value of an undetermined coefficient in the polynomial fitting function, and storing the value of the undetermined coefficient as the fitting parameter of the lens; obtaining the optical center deviation value of the lens accordingto a second motion displacement value during the real-time movement of the lens and the polynomial fitting function; and calibrating the optical center parameter of the lens according to the optical center deviation value of the lens, and aligning and calibrating the 3D measuring device. The method is simple and efficient, and eliminates errors caused by gravity.