The invention discloses a dispatching data network-based restarting device and restarting method for a fault recording device. The restarting device is provided with a communication monitoring module, a single chip microcomputer module and a restarting module, can timely monitor the communication condition of the fault recording device through the communication monitoring module and judges whether the fault recording device is in communication interrupt or not through the single chip microcomputer module; the single chip microcomputer module sends out a warning signal to a remote monitoring host in communication interrupt; and the remote monitoring host transmits a restarting signal to the restarting device through a substation dispatching data network and then cuts off a power supply of the fault recording device through the restarting device to achieve restarting of the fault recording device. The dispatching data network is adopted by the fault recording device, so that the investment cost can be reduced; meanwhile, remote operation of restarting the fault recording device and communication state monitoring of the fault recording device are merged into daily substation monitoring; and the human cost can be saved.