The invention relates to a high-speed railway electric service maintenance auxiliary system based on knowledge service, which comprises a server side and a mobile terminal, and is characterized in that the server side comprises a monitoring data access module, a process management module, a track information management module, a knowledge organization module and a resource management module; the mobile terminal comprises a safety protection module, a position information uploading module, a task list management module, a maintenance decision module and an information bidirectional pushing module. According to the invention, different business services such as identity authentication, operation, equipment and knowledge information management are integrated; on the basis of the design idea facing maintenance knowledge, a maintenance knowledge base is established, monitoring data can be analyzed, faults of track circuits, signal machines and other electric service basic devices can be diagnosed, through interaction and pushing with maintenance site information, operation card control of electric service maintenance is achieved, and the informatization level of site maintenance operation is improved.