The invention discloses a demand side oriented power consumer classification method and system. The method comprises the steps of acquiring power utilization power demand amount of N power consumers so as to acquire N parts of power utilization power demand; and carrying out clustering analysis on the N power consumers by taking the size level of the power utilization power demand and the variation rate level of the power utilization power demand as clustering indexes based on a preset clustering method so as to acquire M categories of power consumers, wherein the power utilization power demand corresponding to all power consumers in each category of power consumers has the same size level and the same variation rate. The method and the system disclosed by the invention realize a purpose of further improving the classification refinement degree of the demand-side power consumers. In addition, the scheme for carrying out clustering based on the variation rate level can effectively weaken a clustering error caused by data exception of partial power supply acquisition points.