Aiming at the problem of low anti attack ability of watermarking system,the research background of digital image watermarking technology is introduced,and selects the original image and watermark image of the digital image,and uses Haar wavelet transform to embed the original image watermarking image.DCT transform is used to restore the digital image that has been added to the watermark image and extract the watermark image.At the same time,the watermark image is attacked by adding white noise,low-pass Gaussian filtering,partial cutting of the image,rotating the image by ten degrees,compressing the image, adding salt and pepper noise and not processing the image.The simulation results are analyzed.The correlation coefficient between the original watermark image and the extracted watermark image is above 90% on average.