The invention provides a load cluster control method and system based on a support vector machine. The load cluster control method and the load cluster control system comprise the following steps: collecting user power consumption data and preprocessing the user power consumption data to obtain a load data sample; Training data set and test data set are established according to the load data sample; The support vector machine classifier is constructed by training data set and testing data set, and the support vector machine classifier is perfected after the support vector machine is perfected.Input the real-time load data to the improved SVM classifier, and output the classification results of the real-time load data. The invention adopts the support vector machine algorithm to classify the user loads in the electric power system, and on the basis of the classification, the load cluster centralized control is carried out, so that the load classification has scientific theoretical support and technical support, and the load classified into the same class is guaranteed to have high consistency.