As China’s first new energy comprehensive demonstration zone, Ningxia’s solar photovoltaic (PV) industry has developed rapidly, but it still faces shortcomings in terms of intelligence and digitalization. This study focuses on the application and construction of an intelligent big data platform based on Narrowband Internet of Things (NB-IoT) technology within Ningxia’s solar PV industry. It explores the application trends of digital technology in the energy sector, particularly in the PV industry under the backdrop of energy reform, analyzes the technological development status of the smart energy field both domestically and internationally, and details the research methods and design components of the platform (including the photovoltaic base data platform, outdoor mobile application, remote data system, and back-office management system). The study discusses the opportunities and challenges Ningxia’s PV industry faces and proposes a construction pathway. It provides a theoretical foundation and technical support for the digital transformation of Ningxia’s PV industry, facilitating industrial upgrading and sustainable development. Although the current research is limited to the proposed design scheme, it establishes a basis for future empirical research and platform development.