The invention discloses a method for searching images. The method includes compressing images to be searched and acquiring grayscale images of the compressed images to be searched; segmenting each grayscale image to obtain a plurality of blocks and acquiring low-frequency zones of each block of each grayscale image; performing binarization processing on the low-frequency zones and acquiring a characteristic value of each block of each grayscale image; matching the characteristic value of each block of each grayscale image with characteristic values of corresponding blocks in a Hash mapping container of the various images and using certain images with the quantities of the successfully matched blocks higher than first preset threshold values as searching results. The method has the advantages that the matched images can be quickly found by means of searching, and influence of variation of local images on the matching accuracy can be reduced. The invention further discloses a device for implementing the method.