Overhead transmission lines and their transmission pole towers have special geographical locations, complex operating environments, multi-faceted operation and maintenance work points, and problems involving complicated tasks, and there are a large number of lines and comprehensive inspection projects every year, and the on-site investigation efficiency is low. In order to solve this problem, this paper introduces an immersive transmission line digital information system that can support the functions of positioning navigation, online ranging, recording real-time temperature and abnormal situation alarm, and briefly introduces the database interaction, VR development and the establishment of three-dimensional models of poles and towers.