The invention discloses an adjustable power correction method for an energy storage power station. The adjustable power correction method comprises the following steps: submitting the current operation mode, adjustable power and response time to a cooperative control main station by an energy storage power station; acquiring real-time operation information of a power grid by the cooperative control main station; calculating a deviation value of the adjustable power of the energy storage power station by the cooperative control main station; and calculating an adjustable power correction valueof the energy storage power station by the cooperative control main station. The adjustable power correction method disclosed by the invention can effectively correct quantity of control measures of the energy storage power station during emergency control of the power grid, improve accuracy of the emergency control and reduce a risk that the quantity of the control measures is too large or insufficient, so that safe and reliable operation of the power grid is realized.