A laser digital image block encryption method based on an improved Clifford chaotic system is proposed to address the serious problem of sensitive information leakage caused by frequent attacks on laser digital images during transmission and storage. Firstly, the Clifford chaotic system optimized by parameters is used to block and scramble laser digital images. By shuffling the arrangement order of image pixels, the complexity of image information and the ability to resist attacks are effectively increased. Secondly, the Logistic chaotic mapping algorithm is used to encrypt the scrambled image sub blocks, ensuring that the information within each sub block is sufficiently confused and diffused. Finally, the overall security of the image is further improved by recombining and re encrypting the encrypted sub blocks using double random phase encoding technology. The experimental results show that this method performs well in protecting laser digital image information, and the encrypted image information has high security, which can effectively resist various attack methods. Meanwhile, the encryption effect of this method is good, and the encryption process is efficient and stable.