In the digital age, network transmission of batch images is increasingly frequent. To prevent the information leak of image content and improve the security of encryption during the network transmission, we design an improved chaotic system, establish a dice-rotation model, and propose a multiple-image encryption algorithm. First, k plain images are combined into an image cube; second, the image cube is divided into dice blocks (i.e., small image cube); third, the dice blocks are rotated and scrambled according to the designed rules, which are controlled by chaotic sequences; finally, the forward addition and modular operations in the row and column directions are performed by the improved chaos. Experimental results and algorithm analyses indicate that the proposed algorithm can encrypt multiple interactive images at once with desirable encryption effect and have strong security.