The invention relates to a user priority classification method in the large-user direct power purchase environment, and belongs to the technical field of power user classification. The method comprises the following steps that (1) indexes are selected from multiple aspects, a large-user priority evaluating index system is established, and quantitative evaluation for large users is carried out; (2) clustering analysis is carried out; and (3) the priority of each type of large users is evaluated. The step (1) further comprises the steps that 1) the admission condition of large-user direct power purchase is analyzed qualitatively; 2) the evaluation indexes are extracted to establish the large-user direct power purchase priority evaluating index system; and 3) the large-user direct power purchase priority evaluating indexes are quantified. According to the method, the large-user direct power purchase priority evaluating index system is established, the priority of a large user is quantified via multiple indexes, and the problem that a present method includes a qualitative standard only is solved.