As one of the core technologies on the high-speed train, the train communication network can realize real-time control and information transmission, so the reliability of train communication network has been brought into focus. Considering topology, reliability of equipment, availability and usability of train communication network, an objective and reasonable reliability evaluation system was established. Analytic hierarchy process was used to determine the weights and membership function of each index, then fuzzy comprehensive evaluation method was used to evaluate reliability of train communication network. The example showed that this method could evaluate reliability of train communication network.