Based on modular functional configuration, this paper aims to explore the iterative process of shared express packaging from functional decomposition, creative reorganization to replacement and reconstruction, innovate the design method of shared express packaging, and design a multi-functional shared express package, thus meeting the functional requirements of different products and the diversified development of consumption. From the problem-oriented perspective, through the current situation of shared express packaging, the feasibility of functional configuration in the design of shared express packaging was discussed. In the design process, the functional requirements of shared express packaging were transformed, the function of shared express packaging was analyzed, and hierarchical modules were divided. With the help of graphical method, functional module combination and decomposition were expanded, and a new design form of shared express packaging was proposed innovatively. The effectiveness of the design method based on function configuration was proved by the practice of shared express packaging design. In the packaging conceptual design stage, the modular function configuration is applied to the shared express packaging design, which clarifies the problems of shared express delivery, guides the design path of shared express packaging, provides creative design reference for shared express packaging, and contributes to the sustainable development of shared express delivery.