The work aims to propose a dual watermarking algorithm based on QR code and DWT-SVD decomposition to further improve the robustness and safety of watermark. The singular value of the secondary watermark was embedded into the singular value of the low-frequency coefficient of the primary watermark after the first-order discrete wavelet transform and then the primary watermark singular value containing the secondary watermark information was embedded into the singular value of the low frequency coefficient after the second wavelet transform of the main image. Through the simulation experiment, the PSNR values of primary watermark and secondary watermark by the proposed algorithm were respectively 66 dB and 60 dB. The proposed algorithm was robust to Gaussian noise, JPEG compression, JPEG2000 compression, rotation attack, contrast enhancement and scaling attacks. The relevant watermark coefficient extracted after attack was close to 1. The algorithm is a non-blind watermark. The secondary watermarks can be detected under various attack conditions, but sometimes the primary watermark maybe seriously distorted.