Since the traditional text encryption algorithm is not applicable to image encryption, the classical Logistic mapping has the problems of 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 mapping is proposed. The initial values and control parameters of improved Logistic and Tent mapping 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 is processed, Arnold transform and xOR pre-encryption are carried out first, and the image is partitioned, and then the sequence generated by Tent map is used for sorting index and circular shift. In the process of encryption, the plaintext image has undergone pixel replacement and pixel diffusion, so that the value and position of the plaintext pixel have changed. Experimental results show that this algorithm has good encryption performance and security.