The work aims to propose a digital watermarking algorithm based on circular angle template for anti-scaling attack and with high watermark capacity, in order to improve the embeddable watermark information capacity of watermarking algorithm and solve the problem of high-intensity scaling attack. Firstly, the original watermark information was converted into a QR code. The data code was extracted according to the QR code generation principle, and then grouped and converted into angle information. Secondly, a basic circular template watermark with directionality and periodicity was randomly generated. Then, it was rotated according to the angle information to generate a circular angle template watermark to be embedded. Thirdly, the embedding of the watermark information was completed by modifying the just noticeable distortion (JND) of the image. Finally, the watermark information was extracted by detecting the angle information in the template watermark. The experimental results showed that, the proposed algorithm could not only effectively resist high-intensity scaling attacks, but also resist color adjustment, rotation, JPEG compression, noise, filtering and blurring. In addition, the algorithm could achieve the embedding and lossless extraction of higher capacity watermark information. Through the application of watermark information preprocessing and circular angle template watermarking, the watermarking algorithm not only has high watermark capacity, but also can effectively resist high-intensity an-ti-scaling attacks. In addition, it also has strong robustness against image processing attacks such as color adjustment and rotation, which meets the needs of practical applications.