Abstract: The UHVDC converter equipment, which is one of the core assets of our country's power grid, is facing the challenge of digitalization in its whole life cycle under the background of energy and power grid digital transformation. Firstly, the paper puts forward the overall goal of digitalization of converter equipment and its digital twin structure and data cornerstone construction method, based on sorting out the current status of digitalization of UHVDC converter equipment and the significance of its digitalization promotion, combined with the current research hotspot - the concept of digital twins. Secondly, some results and experiences of research of key technologies such as for high-reliability and low-power wireless sensor network and its UHVDC converter equipment application scenario have been shared in the aspects of LPWSN system development, multi-physical variable smart sensor development, their verification test respectively. Finally, the considerations and practices of digitalization of converter equipment were summarized and continuous work to the digitalization of converter in the future was outlooked at end of the paper.