To put forward a method of color image watermarking algorithm based on the combination of QR code and chaotic encryption that under Contourlet transform to solve problems of weak geometric attack ability and poor capacity of embedded watermark information in current digital watermarking algorithm. QR code image was used as the watermark. The logistic chaotic sequence was adopted to encrypt the watermark image. Then the watermark image encrypted was embedded into the low pass subband of the secondary Contourlet transform. The relationship between coefficient sizes was used to modify the coefficient and to complete watermark embedding and extraction. Watermark embedding had few influences on the carrier image and the PSNR value could reach 42.764. After rotation, shear and conventional attack, all the watermark extracted can be decoded correctly. The algorithm not only has good security and invisibility but also has good robustness to all kinds of attacks. The information capacity of watermark is higher than that of the ordinary images. The watermark extraction method is blind extraction, which can better meet the practical needs in copyright protection of various digital works.