A device of adjusting a curtailment strategy for a wind turbine, the device being adapted to be applied to a wind turbine subject to a curtailment strategy for shutting down an operation of the wind turbine when a wind speed exceeds a condition setting value for the curtailment, and updating the condition setting value for the curtailment, the device comprising: a fatigue equivalent load calculation unit that is adapted to calculate a fatigue equivalent load for evaluating a fatigue damage of the wind turbine in a predetermined time period by using load data of the wind turbine; and a setting value update unit that is adapted to compare the fatigue equivalent load with a reference load determined by an expected lifetime of the wind turbine, wherein when a difference between the fatigue equivalent load and the reference load exceeds a predetermined threshold value and when the fatigue equivalent load is greater than the reference load, the setting value update unit is adapted to correct the condition setting value for the curtailment that is currently employed to make it smaller by a predetermined amount, when a difference between the fatigue equivalent load and the reference load exceeds a predetermined threshold value and when the fatigue equivalent load is smaller than the reference load, the setting value update unit is adapted to correct the condition setting value for the curtailment that is currently employed to make it greater by the predetermined amount, when the condition setting value for the curtailment is set for each of wind directions that have been set in advance, the fatigue equivalent load calculation unit is adapted -to calculate the fatigue equivalent load for each of the wind directions, and the setting value update unit is adapted to compare the fatigue equivalent load with the reference load for each wind direction, and to correct the condition setting value for the curtailment that is currently employed for each wind direction according to the difference. a fatigue equivalent load calculation unit that is adapted to calculate a fatigue equivalent load for evaluating a fatigue damage of the wind turbine in a predetermined time period by using load data of the wind turbine; and a setting value update unit that is adapted to compare the fatigue equivalent load with a reference load determined by an expected lifetime of the wind turbine, wherein when a difference between the fatigue equivalent load and the reference load exceeds a predetermined threshold value and when the fatigue equivalent load is greater than the reference load, the setting value update unit is adapted to correct the condition setting value for the curtailment that is currently employed to make it smaller by a predetermined amount, when a difference between the fatigue equivalent load and the reference load exceeds a predetermined threshold value and when the fatigue equivalent load is smaller than the reference load, the setting value update unit is adapted to correct the condition setting value for the curtailment that is currently employed to make it greater by the predetermined amount, when the condition setting value for the curtailment is set for each of wind directions that have been set in advance, the fatigue equivalent load calculation unit is adapted -to calculate the fatigue equivalent load for each of the wind directions, and the setting value update unit is adapted to compare the fatigue equivalent load with the reference load for each wind direction, and to correct the condition setting value for the curtailment that is currently employed for each wind direction according to the difference.