Abstract: Through the analysis of the whole process of the erection of the Yangtze River large crossing tower of the 345 meter high, 4520 ton heavy UHV transmission line with a single foundation, The key points of construction technology for erecting the crossing tower by using 500T crawler crane and T2T1500 super large base double arm holding pole are discussed, Based on the assemblage characteristics and type parameters of the large crossing tower, combining with the site layout and the lifting characteristics of lifting equipment, adding independent analysis and planning of lifting methods and lifting machinery installation and disassembly for each part, a comprehensive solution for the construction of the first AC-DC mixed-voltage tower on the Yangtze River crossing tower is obtained.After practical application, it shows that the assemblage.The erection scheme of crossing tower is highly consistent with the site, which is of guiding significance for the construction of the same type of large crossing tower erection in the future.