Aiming at the problems that the existing multiple-image encryption algorithms can only encrypt multiple images of the same type and the same size at the same time, which limits the scope of its application and practicality, a multiple-image encryption algorithm based on image recombination and bit scrambling was proposed. By recombining the images of any number, any type and any size into the new multiple-gray scale images, the algorithm can complete simultaneous encryption at one time, which greatly improved the encryption efficiency and application range. Firstly, the pixel values of all images were extracted to be encrypted in turn and were recombined into N new gray-scale images of m×n size, which were converted into m×n×8N binary matrix next. Then, 3D bit scrambling is adopted to scramble rows and columns for high binary pages and the entire pages for low binary pages. Finally, the ciphertext image was obtained by XOR diffusion operation. The high-low separate scrambling improves the anti-noise ability of the algorithm. The information entropy of the final ciphertext was above 7.999, which well covered up the statistical characteristics of the plaintext. A new type of Logistic-Fibonacci cascade chaos was constructed to generate random sequences, which increased the range of initial values and control parameters, expanded the key space to over 8×10⁸⁴, and greatly improve the ability to resist exhaustive attacks. The randomness of the sequence was improved, while the rapidity of the low-dimensional chaotic system was preserved. Combining with the plaintext hash value (SHA-256) to generate the key, the change rate of the ciphertext pixel value reached more than 0.996 after the plaintext pixel value was slightly changed, which greatly improved the sensitivity of the plaintext and the ability of resisting the selective plaintext attack. Experimental analysis show that the proposed multiple-image encryption algorithm has high security and strong practicability.