The utility model relates to a power distribution network overhead line fault monitoring device, include: remote communication module, controller, data acquisition device, mains operated module and power overload protection device, remote communication module and distribution network control center's backend server pass through wireless connection to be connected with the controller, data acquisition device and mains operated module are connected with the controller respectively, power overload protection device is connected with data acquisition device, controller and mains operated module respectively, distribution network overhead line is connected to the data acquisition device, remote communication module receives the data acquisition instruction that backend server sent to with data acquisition instruction issue to controller, controller output data acquisition instructs to the data acquisition device, distribution network overhead line's state information is gathered to the data acquisition device, and will state information transmits and monitors to the controller, has improved the judgement efficiency and the rate of accuracy of distribution network overhead line trouble.