A digital protection system is provided. The digital protection system may include: a process protection system including at least two channels, each channel including a first bistable logic controller and a second bistable logic controller which are independent and different from each other, the first bistable logic controller and the second bistable logic controller outputting bistable logic results; a reactor protection system including at least two trains, each train including a first coincidence logic controller and a second coincidence logic controller which are independent and different from each other, the first coincidence logic controller and the second coincidence logic controller outputting coincidence logic results by receiving the bistable logic results from the process protection system; and an initiation circuit normally operating or stopping a reactor according to the coincidence logic results received from the reactor protection system.