The invention discloses a wind turbine generator product consistency evaluation method and system, and the method comprises the steps of determining the voltage drop/rise amplitude and the fault typeof a fault wind turbine generator and the fault voltage ride-through performance index value of the wind turbine generator based on the grid-connected operation data of the wind turbine generator; determining a fault voltage ride-through performance index value of a type test prototype corresponding to the wind turbine generator based on the fault type and the voltage drop/rise amplitude of the wind turbine generator; based on the deviation of the fault voltage ride-through performance indexes of the wind turbine generator and the type test prototype, performing consistency evaluation on the wind turbine generator and the type test prototype. The method is simple, practical and easy to implement, provides a means for judging whether the fault voltage ride-through capability of the grid-connected wind turbine generator is consistent with the prototype characteristics of the type test or not, provides the technical support for the wind power grid-connected supervision, and guarantees theoperation safety of a power grid after the large-scale wind power is connected into the system.