Addressing the current focus of intelligent construction in hydropower projects primarily on dam building, this paper demonstrates the significance and innovation of the ‘1 + 3 + N’ intelligent construction system developed for the TB hydropower project. The system expands intelligent construction functionalities and has been comprehensively applied to the TB project. Supported by ‘1’ intelligent construction platform, it focuses on ‘3’ key technologies of intelligent dam, intelligent aggregate processing, and intelligent underground powerhouse, and covers ‘N’ application scenarios across all aspects of the construction area. Based on the closed-loop control theory of comprehensive perception, accurate analysis, real-time control, and continuous optimization, the system achieves engineering practice and application of intelligent construction modules, effectively promoting the high-quality and efficient completion of the TB project. Notably, it produced the longest core sample (26.5 m) of roller-compacted concrete (RCC) in China. The ‘1 + 3 + N’ system can be extended to various types of hydropower projects including pumped storage power stations, laying the foundation for integrated basin-level intelligent construction. Future recommendations include building an autonomous full-life-cycle smart hydropower platform, deepening the application of intelligent construction platforms, improving hardware infrastructure, formulating standards and norms, creating ‘BIM +’ application scenarios, and strengthening contractual agreements.