The present invention relates to an offline variable monitoring system and method for MPUs of an EMU train, comprising a serial port unit, an Ethernet interface, a TF card interface and a status indicator, which are all electrically connected to a main control unit; the main control unit is connected to a PC and TF expansion card via the Ethernet interface and the TF card interface separately, and records monitored offline variable values into the TF expansion card. The monitoring method comprised three operating modes: a configuration mode, a working mode and a download mode, which realize the monitoring of offline variables by using a multithread operating system including a TCP/IP communication thread, a main control thread and a serial port data monitoring thread. The way of recording the monitored data may be configured flexibly; and the monitoring of four central control units MPUs of the EMU train may be realized.
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