The invention provides a method for carrying out relative radiometric calibration on a CCD (Charge Coupled Device) image, which is used for carrying out relative radiometric calibration on an original image obtained through push broom of a one-dimensional CCD camera. The method comprises the following steps of step A testing radiometric calibration data (formula) of each detection unit of the one-dimensional CCD camera under different integrating sphere output radiances Lj and different integral times Tk by utilizing an integrating sphere method; step B computing a relative radiometric calibration coefficient of each detection unit by the radiometric calibration data (formula) of each detection unit of the one-dimensional CCD camera under different energy levels Lj and different integral times Tk through an improved relative radiometric calibration model through; and step C carrying out radiation intensity calibration on each pixel in the original image by utilizing the relative radiometric calibration coefficient of each detection unit corresponding to a pixel so as to obtain an image after relative radiometric calibration. According to the method, the problem of obvious chromatic aberration of a splicing image of the interior of the same flight strip and an adjacent flight strip, which is caused by the difference between the integral times during processing of an airway array CCD image, is avoided.