The rural digital governance platform is closely related to rural sustainable development. By playing the role of the rural digital governance platform, it can optimize the allocation of rural resources, improve the efficiency of rural governance, promote the development of rural industries, improve the quality of life of rural residents, promote the inheritance and innovation of rural culture, and provide a strong guarantee for the sustainable development of rural areas. Through the continuous advancement of the rural digital governance platform, it is anticipated to achieve the modernization of rural governance, promote industrial prosperity, optimize public services, encourage talent return, and foster cultural inheritance and innovation. This will provide a robust foundation for the implementation of the rural revitalization strategy. Guided by the “digital village” strategy, digital platforms serve as pivotal vehicles for the transformation of rural digital governance. Taking the policymaking process facilitated by the “JuHaoban” platform as a case study, this paper integrates theoretical frameworks with practical applications to construct a “Mixed-Scanning–Multiple-Stream” framework. This framework elucidates the policy innovation process at the local-decision-making level under the influence of the central strategy. The findings indicate that the problem stream can be generated through both proactive scanning and reactive response mechanisms, which can operate concurrently. Decision makers at various levels function as policy entrepreneurs, leading the policymaking community, and the policy window can open either opportunistically or continuously, driven by these decision makers. The policy establishment process of Julu County’s “JuHaoban” platform exemplifies an “up-and-down” dynamic, primarily influenced by political streams. By proactively identifying social issues and responding to emergencies, county-level decision makers implement policy innovations in alignment with the “digital village” strategy. The “Mixed-Scanning–Multiple-Stream” framework provides substantial explanatory power regarding local policy innovation processes within central–local interactions. The conclusions and recommendations offer significant policymaking implications for the development of rural digital governance platforms.