The invention discloses a nuclear power station electric generator inner stator replacement method. The method comprises the steps that the nuclear power station electric generator inner stator replacement technology flow path is broken up into technological sequences; an electric generator inner stator three-dimensional model and a virtual scene are built; on the basis of the technological sequences, the three-dimensional model is used in the virtual scene for simulating the electric generator inner stator replacement technological processes; the simulated replacement technological processesare rehearsed, after rehearse is passed, the rehearse scheme is adopted as the electric generator inner stator replacement scheme. The invention further discloses a nuclear power station electric generator inner stator replacement system. The nuclear power station electric generator inner stator replacement efficiency and accuracy can be improved.