The invention provides a standby control method and device for a wind generating set. The standby control method comprises the following steps: controlling each wind generating set to enter a standbystate when an average value of predicted wind speed in each predetermined time interval in a future first predetermined time period is smaller than a cut-in wind speed; or, when a power limiting instruction is received, determining a power limiting proportion according to the average value of the predicted wind speed in each predetermined time interval in the future first predetermined time period, and controlling at least one wind generating set corresponding to the determined power limiting proportion to enter the standby state.