This paper focuses on the Industrial Internet of Things (IIoT) cloud platform, a core hub for industrial digital transformation that integrates data acquisition, intelligent analysis, digital twin visualization and other key functions. It deeply analyzes five core technologies of the IIoT cloud platform, expounds how it breaks industrial information silos to realize efficient device interconnection and data sharing, and reveals its value in reshaping the industrial ecosystem and driving industrial digital and intelligent upgrading. Combined with practical solutions such as the Energy Management System, it also demonstrates the platform’s practical application value, providing technical references for industrial digital transformation practices.