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In the train operation control system, the vehicle ATC equipment log records all the information of the whole operation cycle of each subsystem. Analyzing the log is an important means to monitor the state of vehicle equipment and analyze the failure of the system. However, there are the following problems in actual maintenance: 1. equipment actual input and output, vehicle power supply and sensor power supply contain a large number of fault feature information, and these information are not effectively recorded in the existing vehicle signal system; 2. the collection of log collection relies on manual, low efficiency and high cost; 3.fault diagnosis relies on experience, and the diagnosis results are limited. On this basis, this paper proposes a non intrusive on-line detection and operation system for vehicular signal equipment. The scheme uses non-contact sensors to collect signals, and the vehicle logs are transmitted by wireless communication network. Through the analysis of the large data of the ground side servers, the state monitoring of the subsystems and key components is carried out, and the abnormal information is alerts.