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• The corona loss data of 4–10 bundle LGJ400-35 conductors was measured for the first time at a high altitude (2200 m) using a self-developed corona loss measurement system. • Based on experimental data and referring to the BPA formula, a prediction formula for corona loss of LGJ400-35 wire under different bundle numbers and surface electric field strengths of the wire was fitted. • Build a wire corona cage structure model in COMSOL multiphysics software for simulation analysis, and fit the correction factor for the effect of wind speed on wire corona loss. The corona loss generated by the conductor is one of the important factors in the design of ultra-high voltage (UHV) direct current transmission lines. This article is based on the high-altitude (2200 m) ultra-high voltage corona cage experimental platform built in Xining City, Qinghai Province. For the LGJ400-35 conductor used in the typical ± 800 kV DC transmission lines from Qinghai to Henan Province, positive and negative polarity corona experiments were conducted on LGJ400-35 conductors with 4, 6, 8, and 10 bundle under surface field strength conditions of 14–22 kV/cm. For the first time, corona loss data of bundle conductors in positive/negative polarity ultra-high voltage DC transmission lines were obtained, Fit the prediction formula for corona loss of transmission lines under different bundle numbers and surface electric field strengths of wires. And build a model in COMSOL Multiphysics software for simulation analysis, fitting the correction factor for the impact of wind speed on wire corona loss. The research results in the article can provide data reference and support for the construction of ultra-high voltage direct current transmission lines in high-altitude areas. [ABSTRACT FROM AUTHOR]