The invention provides a wind turbine generator fault ride-through control method and a system. The method comprises the following steps that when having a fault, a flexible direct current converter station emits an active power control signal to a wind turbine generator according to a preset active power control strategy table and drives the wind turbine generator to carry out active power control; and when returning to operate, the flexible direct current converter station updates the active power control signal according to the active power control strategy table, emits the active power control signal to the wind turbine generator, drives the wind turbine generator to carry out the active power control and completes fault ride-through. In the technical scheme, when the fault is generated, wind power output power is timely adjusted; and after fault recovery, the control signal is timely updated, the output of the wind turbine generator is further and accurately adjusted, and the power balance of a power grid is guaranteed so that the wind turbine generator and the flexible direct current converter station realize the fault ride-through.