The invention discloses a distribution feeder automatic system which comprises at least one wireless feed state sensor, a concentrator and a monitoring master station. The at least one wireless feed state sensor is connected with a feeder line through an RS485 bus, and is used for collecting the state information of the feeder line. The concentrator is connected with each wireless feed state sensor through a wireless sensor network, and is used for receiving the state information collected by each wireless feed state sensor. The monitoring master station is connected with the concentrator through a passive optical network, and is used for receiving the state information received by the concentrator. According to the distribution feeder automatic system, the characteristics of the RS485 bus, a WSN network, a power line and the passive optical network are comprehensively used, the problems that wiring is difficult, the rerouting project amount is large, the line can be damaged easily, moving can not be achieved, operating is unstable, and the reliability is poor in an existing power distribution feeder automatic network are effectively solved, and the distribution feeder automatic system is suitable for power distribution feeder automation.