The invention discloses a three-level residual current operated protection simulated practice training system comprising a three-phase four-wire program control voltage source. The three-phase four-wire program control voltage source is connected with a main trunk divided into two branch trunks, the main trunk is connected with ammeters of different phases and a universal change-over switch in sequence, the output end of the universal change-over switch is connected with a first-level residual current operated protection module, the first-level residual current operated protection module comprises a residual current protector and a current transformer, and the main trunk is further provided with a reactive compensation controller; the first branch trunk is provided with a second-level residual current operated protection module and a first fault simulation module, and the second branch trunk is provided with a third-level residual current operated protection module and a second fault simulation module. The three-level residual current operated protection simulated practice training system simulates the operating mode of a whole power transformation distribution room and covers multiple residual current protection points of the main trunk, the branch trunks and the like, and a scene of residual current protection fault in the operation of a low-voltage grid can be achieved.