In the construction of navigation and electricity hub projects，traditional river-crossing leveling for high-grade elevation control measurement cannot be implemented. In view of this，this paper carries out research on the theory and application practice of a precision triangulation elevation measurement technology. The paper introduces the principle of triangulation elevation measurement technology，analyzes the factors affecting the error of triangulation elevation measurement，and proposes measures for mitigating errors. Taking the elevation control network measurement in Qianwei navigation and electricity hub as a case study，we use the Leica TS50 measuring robot and selects a suitable observation time window to verify the feasibility of replacing second-class river-crossing leveling with total station precision triangulation elevation measurement. Practice shows that the method is effective and can meet the difference limit requirements of second-class leveling specifications. The research results can provide guidance for the high-grade elevation control measurement in subsequent large-scale navigation and electricity hub construction.