The present invention provides a coordinate calibrating method of touch control screen, wherein the method comprises the following steps: providing a display panel which comprises a plurality of display coordinates and a display coordinate value of first axis in the direction of the first axis; providing a capacitive sensor which is configured with a plurality of induction electrodes that are respectively corresponding with a plurality of capacitive coordinate values in the direction of the first axis, and is provided with a maximal capacitive coordinate value; when the capacitive sensor is touched, a plurality of digital values corresponding with each capacitive electrode are detected; multiplexing the digital value with the capacitive coordinate value corresponding with each capacitive electrode for obtaining an addition value; dividing the addition value by the maximal capacitive coordinate value for obtaining an interpolate value; and multiplexing the interpolate value with the display coordinate value of first axis for obtaining a calibration coordinate. The coordinate of edge is determined with the digital value corresponding with the equivalent capacitance induced by the edge induction electrode. The problem that the configuration of coordinate of condenser type touch control board is unmatched with the configuration of coordinate of display is settled.