The invention relates to a power load prediction correction method, especially to an improved-support-vector-machine-based power load prediction correction method. With the method, problems that the current and future power demand changes and the power demand development trend can not be reflected accurately and the power load accuracy prediction is low can be solved. Therefore, the invention puts forward an improved-support-vector-machine-based power load prediction correction method. The method comprises: step one, sample data are selected from a database or a field; step two, the sample data are coded; step three, pretreatment is carried out on the coded sample data; step four, a kernel function is initialized; and the sample data after pretreatment are processed by selecting a Gaussian radial basis function; and step five, power load prediction is carried out by using an improved support vector machine. The method is applied to the power load prediction correction field.