The invention relates to an image change detecting method based on principle component general inverse transformation in the technical field of image processing. The method comprises the following steps of: carrying out transformation in two characteristic spaces after reorganizing data of an image to be detected; carrying out waveband updating differential treatment in the transformed characteristic spaces to obtain a changed component; and extracting a change area by an automatic threshold value confirming method to realize image change detection. The invention carries out differential detection on an image in the characteristic spaces obtained after principle component general inverse transformation, effectively inhibits noise, reduces the influence of image fuzzy distortion, and the like on the reduction of detecting precision and improves the detecting precision.