The invention discloses a power communication system, and particularly relates to a power communication integrated data network system and a communication method thereof. The structure of the power communication integrated data network system is as follows: a central station host is connected with a central station standby computer, a sending interface of the central station host is connected with a first receiving interface of each communication station, a first sending interface of each communication station is connected with a receiving interface of the central station host, a second receiving interface of each communication station is connected with the sending interface of the central station standby computer, and a second sending interface of each communication station is connected with the receiving interface of the central station standby computer. The power communication integrated data network system provided by the invention can effectively solve the master-slave switch ineffectiveness problem caused by single pass of an optical fiber when a communication network two-layer convergence device respectively carries out double uplink with different PE devices, thereby guaranteeing the security and stability of a power communication network, guaranteeing errorless transmission of communication data network bearer services, facilitating to construct a strong grid and improving the scheduling information, digitization, automation and interaction levels.