This paper proposes a novel spatiotemporal chaotic system: a dual-dynamic-coupling-coefficient coupled map lattice with delayed feedback (DDCMLDF). Building on the traditional Coupled Map Lattice (CML), we introduce two dynamic coupling coefficients and a random delay mechanism. These enhancements enable our system to exhibit more complex chaotic behavior, making it more suitable for applications in chaotic encryption and secure communication. Based on this system, a multi-image encryption algorithm is proposed. This encryption algorithm first utilizes chaotic dynamics theory to perform internal scrambling of the images. Then, using the concept of multi-path merging, scrambling is performed among the images, further disrupting the relationships between them. Finally, a diffusion operation is applied separately to each scrambled image. A series of simulation experiments demonstrates that this encryption algorithm has good security and robustness.