The invention discloses a power compensation calculation method under emergency demand response The method comprises the following steps: for emergency demand response areas, calculating total power failure loss of a target area within a year in the further according to historical power data of a reference area; and for the target area for executing the emergency demand response, establishing a total interrupt compensation target function and constraint conditions thereof and carrying out calculation to obtain a power compensation result. The method can simply and efficiently calculate the compensation amount of emergency demand response provided for different regions and different kinds of users so as to provide reference for making of a demand response plan.