The work aims to propose a reversible watermarking algorithm of region of interest based on IWT-Schur for the shortcomings of the watermarking algorithm in traditional region of interest against geometric attack. Firstly, the carrier image was wavelet transformed, and the sub-band ROI coefficients were filtered out. Then, the Arnold transform was used to encrypt the watermark image, and the encrypted watermark image was used as an integer wavelet transform to obtain a series of components. Finally, combined with the Schur decomposition, the components of the watermark were correspondingly added to the ROI of each sub-band of the carrier. The embedded wavelet transform and the Schur decomposition of the matrix made the water-printed image have good visual quality and the algorithm was easy to implement. The watermark detected when the watermarked image was not disturbed was consistent with the original watermark. When the watermarked image was attacked, it also showed good performance, and the quality of detected watermark was good. Experiments show that the watermark extraction is correct and the region of interest is not restored.