A digital watermark technology combining with image normalization and holography was presented. The image was normalized using normalization technology and the binary watermark was processed to get the holographic image based on holographic technology; the middle-frequency coefficients in discrete cosine transform (DCT) domain of every image block were collected and discrete wavelet transform was carried out on the matrix of the middle-frequency coefficients; the holographic image was embedded into the low-frequency coefficients. Because of the anti-affine transformation performance of image normalization and the anti-crop performance of holographic technology, the presented digital watermark technology has a strong performance of anti-affine transformation. The technology can be used to protect the copyright of digital images.