The invention discloses a special router-based control system for a power plant public system, which comprises a public system control domain and at least two unit set control domains, wherein the public system control domain and each of the unit set control domains are connected by the special router. The unit set control domains and the public system control domain are connected by the special router and the redundant design can be realized through a main router and a backup router, so that that the control over the public system can be switched safely and reliably between unit sets is ensured, and the control is monitored and operated safely and reliably by the unit set at any time. The monitoring of the unit set on the public system refers to the monitoring of the public system by MMIsites on the unit set.