The invention relates to a common control net for a nuclear power station, which comprises an electrical control subring net, a sub-control subring net and a monitoring layer ring net, wherein the electrical control subring net is used for being connected with a nuclear power station electrical system, and controlling and monitoring the connected nuclear power station electrical system; the sub-control subring net is used for being connected with a sub-system of the nuclear power station, and controlling and monitoring the connected sub-system of the nuclear power station; and the monitoring layer ring net is respectively connected with the electrical control subring net and the sub-control subring net in order to exchange data with the electrical control subring net and the sub-control subring net respectively and sends a corresponding operation command. The technical scheme of the invention solves the problem that the common system can not be controlled, which is generated by different retirement periods caused by different service life in the nuclear power station management; the invention can not be influenced by the set retirement, realizes the network control of the common system, improves the information exchange speed and increases the information exchange volume, reduces operators, improves the operable rate and the usability of the common system, and further improvesthe economy of the nuclear power station operation.