Calibration method and system for eliminating orthogonal error of plumb line coordinatograph

The invention provides a calibration method and system for eliminating orthogonal errors of a plumb line coordinatograph, and relates to the field of plumb line coordinatograph calibration. The method comprises the following steps of: presetting a grid chart with standard grid point coordinate values, establishing corresponding grid coordinates, keeping a vertical line unchanged, moving a vertical line coordinatograph to the position of each grid point on the grid chart one by one on the same horizontal plane, and recording initial measurement values Vx and Vy of an X axis and a Y axis of the vertical line coordinatograph; and finally, carrying out calibration calculation on the initial measurement values Vx and Vy based on the standard coordinate value of each grid point, and rapidly and effectively carrying out calibration processing on the orthogonal error of the plumb line coordinatograph. The system comprises a grid division module, a measurement module and a calibration module. The whole method is simpl