Abstract: The valve-side bushing of converter transformer is an important component in the ultra-high voltage direct current transmission system. Traditional fault warning and status evaluation methods rely on a large amount of physical experiments and manual data collection. Therefore, this paper focuses on the research of digital twin models for valve-side bushings, proposes a construction standard for digital twin models of power equipment, and establishes a valve-side bushing twin model based on geometric models of solid bushings. The research results show that the digital twin model of the valve-side bushing can effectively consider nonlinear characteristics of the insulation material of the valve-side bushing core in the temperature range of –40~120 ℃ and the frequency range of 10⁻¹~10³ Hz. Further application of the valve-side bushing twin model can obtain direct heat transfer characteristics between the bushing conductive rod and the insulating oil, and the temperature at the tail of the valve-side bushing is close to the transformer oil temperature of 90 ℃. The twin model proposed in this paper can significantly improve the calculation speed of the electromagnetic heat flow coupling model, and achieved visualization of the operating status platform of the valve-side bushing. The nonlinear mathematical model of electric thermal coupling proposed in this paper and the digital twin platform of the converter valve-side bushing were applied to generate the relevant structural parameters of the bushing. The scaled valve-side bushing was produced and manufactured, and the negative polarity cut-off lightning impulse 575 kV voltage series on-site tests were conducted. Based on the proposed digital twin model structure, this paper constructs the digital twin visualization platform for the converter valve-side bushing, effectively improving the efficiency of valve-side bushing operation and monitoring, and realizing the application of valve-side bushing visualization monitoring and digital twin technology.