The invention discloses a coordinated control method and a device for frequency regulation and voltage regulation of a doubly-fed wind turbine generator system under the condition of a weak power network. The method comprises the following steps: detecting a power network frequency and a power network voltage of a power system; judging whether the power network frequency crosses a frequency dead zone; judging whether the power network voltage crosses a voltage dead zone; and judging whether the power network voltage crosses a voltage dead zone. If the grid frequency crosses the frequency deadzone and the grid voltage crosses the voltage dead zone, the grid frequency is regulated by the active power control of the wind turbine generator system, and the grid voltage is regulated by the reactive power control of the wind turbine generator system. If the grid frequency does not cross the frequency dead zone and the grid voltage crosses the voltage dead zone, the grid voltage is regulatedby the reactive power control of the wind turbine generator system, and the active power damping control of the wind turbine generator system is carried out. The technical proposal disclosed in the present application can improve the frequency and voltage stability of the power system.