In the context of intensifying global technological competition and the emergence of "Sovereign AI" as a national strategic priority, the development of an autonomous knowledge system has become a central issue in safeguarding national digital sovereignty and cultural security. This paper systematically explores the urgency, theoretical foundations, and practical paths for building China's digital humanities autonomous knowledge system. It first examines the meaning of "Sovereign AI" in terms of technological control and cultural and semantic dimensions, analyzing its role in countering "digital colonialism." Building on this, the paper introduces Professor Duan Yucong's theory of "semantic sovereignty" and the DIKWP (Data-Information-Knowledge-Wisdom-Purpose) model as the core theoretical framework, arguing that the construction of an autonomous knowledge system in China must involve deep leadership over both the content and value intentions of knowledge. By analyzing key cases such as the China Academic World platform, the Shidian Ancient Books platform by ByteDance and Peking University, and the ICH-Qwen large language model, the paper reveals a construction path that integrates top-level design, technological empowerment, and paradigm innovation. The research indicates that China's digital humanities autonomous knowledge system is built on the Sovereign AI strategy, with semantic sovereignty as the core, using digital platforms and intelligent tools to achieve data autonomy, knowledge innovation, and value guidance. Finally, the paper reflects on potential challenges such as the "sovereignty trap" and envisions the future of an open, confident, and globally influential Chinese digital humanities academic community.