The invention proposes an energy storage output control method for stabilizing the ramp rate of a wind power plant, and the method can stabilize the ramp rate of the wind power plant through the following steps: 1), predicting the output of the wind power plant at a next time segment through the historical data updating in a rolling manner; 2), calculating and obtaining a predicted ramp rate at the next time segment; 3), judging the ramp direction of the wind power plant at the next time segment, comparing the predicted ramp rate with a given upward or downward ramp rate limit value, calculating the difference between the predicted ramp rate and an allowed value when the predicted ramp rate exceeds an allowed ramp rate range of the wind power plant, and obtaining an energy storage output instruction; 4), enabling an energy storage system to execute an output instruction.