In order to solve the problem that the traditional preparation process is inefficient and the standard of processing accuracy is poor in the composite molding of high barrier aluminum plastic bags and container bags, the work aims to develop a new process of composite high barrier packaging bags and design a special mechanical equipment for automatic composite molding of the two bags. Based on the principle of modular design, through the detailed three-dimensional modeling study of each section of the production line, each part achieved the best synergistic effect, and then the prototype was debugged and optimized. The difficulty of automatic conveying and processing of large flexible bags was solved. Through experiments, compared with the original process, the new process improved the connection strength by 2~3 times, the production efficiency by 5 times, and controlled the center line deviation accuracy within 10 mm. The automatic composite molding equipment has a reasonable structure, ensuring the processing quality under the premise of greatly liberating the labor force and providing reference cases for flexible packaging industry and other types of production line design.