Digital platform is an important opportunity for major players to seize the commanding heights of a new round of science and technology industrial revolution, which effectively links producers and consumers in a low-cost, highly inclusive, high-efficiency and high-value way, and plays an important role in helping rural revitalization and achieving common prosperity. This paper takes "agricultural-expo online" of Zhejiang platform as an example, analyzes the framework and functions of digital platform, shows the initial results of digital platform enabling common prosperity, refines the theoretical framework of digital platform enabling common prosperity, and discusses the constraints and substantive problems of digital platform enabling common prosperity. In view of the problems existing in digital platforms, such as unclear corporate responsibility, unfair value distribution and unbalanced benefit distribution, unbalanced application of digital basic platforms and obstacles to the development of public welfare digital platforms, this paper puts forward countermeasures and suggestions such as clarifying responsibility boundaries, allocating resources fairly, optimizing platform functions, exploring sustainable profit models and multi-party collaborative support. It provides a reference for answering how digital platform can promote common prosperity more effectively.