Abstract: To implement the requirements of national water network construction and river protection and management,support the construction of the "Smart Water Qilu" digital twin system,solve the common problem of "vertical fragmentation and horizontal dispersion" of provincial water conservancy knowledge resources,and adapt to the knowledge service needs of multi-level water conservancy business scenarios,this paper takes the Shandong Provincial Digital Twin Water Conservancy Knowledge Platform as an example. It systematically explores the construction path of the knowledge platform from aspects such as establishing a knowledge resource system,collecting multi-source knowledge resources,building a water conservancy knowledge base,constructing a water conservancy knowledge graph,and developing a knowledge service platform. The architecture and main functions of the platform are elaborated in detail. Furthermore,innovative practices adopted during platform construction,including multimodal data governance and resource integration,knowledge updating and intelligent service mechanism innovation,and bidirectional empowerment between knowledge graphs and large models. The application scenarios of the knowledge platform are also discussed. The relevant results and practices presented can provide reference and inspiration for the construction of provincial digital twin water conservancy knowledge platforms.