The invention discloses a state monitoring system for a merging unit and an intelligent terminal and relates to the field of electric power system control. At present, the intelligent substation merging unit and intelligent terminal belong to process level equipment and are usually mounted in an outdoor intelligent control cabinet, the running environment is bad, the information is not intuitive, and the process is not clear. The device temperature, internal working voltage and optical Ethernet port running condition are monitored through an IIC multi-channel transfer switch and an SFP optical module, the device software version and configuration version monitoring is realized through character string sending, an inside board card fault warning of the device is released through a GOOSE communication releasing device by a device address mapping table and a fixed-length string method, and a command received by an intelligent terminal is fed back through combining a control command information source with the control command. By means of the technical scheme, the state monitoring system for the merging unit and the intelligent terminal realizes to intuitively monitor the states of the merging unit and intelligent terminal.