Traditional text encryption algorithm is not applicable to image encryption, so classical Logistic map has limited range of system parameters and unequal distribution of chaotic sequences. In this paper, an image encryption algorithm based on cyclic shift combined with improved Logistic and Tent map is proposed. The initial values and control parameters of improved Logistic and Tent map were set, and the bitt retake technology was applied to improve the chaos effect in the transition state, so as to improve the effect of image encryption algorithm. When the plaintext image was processed, Arnold transform and XOR pre-encryption were carried out first, and the image was partitioned. Then, the sequence generated by Tent map was used for sorting index and circular shift. In the process of encryption, the plaintext image underwent pixel replacement and pixel diffusion, so that the value and position of the plaintext pixel were changed. Experimental results show that this algorithm has good encryption performance and security.