The embodiments of the invention provide a grid interfering protection setting correction method. The method comprises the following steps: establishing a large-power-grid whole-process simulation analysis data model comprising a generator over-excitation restriction/overload protection model, performing a disturbance fault on a target power grid area, and based on the simulation analysis data model, screening a generator set at an over-excitation state in the target power grid area; and setting long-term permissible currents for over-excitation restriction and long-term permissible currents for rotor overload protection, of the generator set to be the same. The grid interfering protection setting correction method provided by the invention brings a generator voltage support effect into play as much as possible on the basis that set safety is guaranteed, carries out fault simulation analysis by use of the large-power-grid whole-process simulation analysis data model, and then corrects the long-term permissible currents for the over-excitation restriction and the long-term permissible currents for the rotor overload protection, of the generator set so as to improve the medium and long-term safe stable operation level of an interconnection power grid.