Abstract: In order to improve the safety guarantee coefficient of the maintenance process of the heavy haul railway power supply team, shorten the operation time, and reduce equipment operation and maintenance costs, this paper designed an intelligent operation and maintenance mobile application for heavy-duty railway power supply, and elaborated on its overall architecture, network architecture, and key technologies. This mobile application was based on an Android mobile terminal and used Java and HTML5 technology to implement functions such as operation command, operation process control, maintenance ledger filling, and operation data query. The trial application results show that this application can improve the intelligence level, safety guarantee coefficient and work efficiency of the maintenance process of heavy haul railway power supply teams, and has positive significance for the development of intelligent operation and maintenance of heavy haul railway power supply.