The invention discloses a change detection method for synthetic aperture radar (SAR) images of spectral clustering, and belongs to the technical field of image processing. The change detection method comprises the following steps of: (1) selecting two SAR images T1 and T2 with same size and different time intervals as test images; (2) building a difference molecular map D1 of the test image T1 and the test image T2 by a different value method; (3) building a difference molecular map D2 of the test image T1 and the test image T2 by a field ratio method; (4) merging the difference molecular mapD1 with the difference molecular map D2 by a product transformation fusion method to generate a difference map D; and (5) clustering pixels of the difference map D to obtain a change detection resultmap by a spectral clustering method. By the method, speckle noise of the difference map is suppressed better, speckles in the change detection result map are effectively removed, and more accurate change detection result map is obtained. Moreover, the method can be applied to detection and processing of remote sensing image change.