In order to meet the needs of intelligent detection and monitoring of catenary in the main line section of Lanzhou-Urumqi high-speed railway line above altitude 2 500 m, a catenary detection vehicle for Qinghai-Tibet railway high-speed section was developed. A series of measures had been taken to adapt to the harsh climatic conditions such as high altitude, low atmospheric pressure, anoxia, high cold, windy sand and strong ultraviolet radiation in the plateau area. The vehicle was equipped with catenary suspension condition detection and monitoring device, which could carry out high-precision imaging detection of catenary suspension system components. On the basis of automatic identification and analysis of test data, maintenance suggestions were formed to guide catenary maintenance.