The invention relates to a substation output platen state monitoring system, which comprises an output platen monitoring terminal module, a configuration tool module, and a data acquisition and display module. The output platen monitoring terminal module comprises an analog quantity input processing module, a digital signal processing module, an input matching and data processing module, a real-time database module, a communication protocol server module and a configuration loading module. The configuration tool module comprises a platen input configuration module and a communication configuration module. The data acquisition and display module comprises a communication protocol client module, a database module and a graphic display module. According to the invention, the substation output platen state monitoring system is composed of the configuration tool module, the output platen monitoring terminal module and the data acquisition and display module, the system can be used for facilitating the check of an enabled/disabled state signal of an output platen, and the access of a third-party communication protocol client can be met through the configuration of a communication protocol.