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With the rapid development of wind power generation technology, large-scale wind farms are connected to the power grid, which makes the voltage stability of the system vulnerable to the multi time scale characteristics of wind farms. Therefore, the voltage/var control strategies have received extensive attention. This paper proposes a hierarchical voltage/var optimization control strategy of wind farms based on the mult-itime scale characteristics of voltage/var control devices in the wind farm. Compared with the traditional voltage/var control strategy, this strategy coordinates different control stages in multiple time ranges. In this way, different voltage/var control devices can cooperate to realize the voltage/var optimization control of the wind farm. The performance of the proposed strategy is verified through a wind farm model of doubly-fed induction generator type in MATLAB / Simulink. The simulation results show that this strategy can effectively reduce the power loss and voltage deviation.