Abstract: In order to solve the contradiction of transparency and robustness of traditional robust watermarking, a robust zero-watermarking algorithm based on block energy relationship is proposed. Firstly, the logistics mapping with parameters, chaotic encryption and scrambling algorithm are designed to preprocess the original copyright image. Secondly, the proposed algorithm divides the cover image into blocks, and constructs a characteristic signal by calculating the average energy relationship between the entire image and each block. Finally, the encrypted copyright image and the characteristic signal are conducted XOR operation to generate a zero-watermarking signal. The experimental results show that the proposed algorithm has good robust performance against noise, filtering, JPEG compression, scaling and rotation attacks. Compared with similar algorithms, it has low computational complexity and strong robustness.