The invention relates to a method for automatically classifying text documents by utilizing a body, comprising the following steps: firstly expressing the characteristic information of a text document by utilizing a weighted key word set; and then expressing the characteristic information of a classifying catalogue by a body which is subject to body disambiguation and body expansion; transforming the body into a weighted word meaning set through analyzing the body structural characteristic; finally calculating the semantic similar value between the key word set of the text document and the body weighted word meaning set by utilizing a Earth Mover's Distance method; further calculating the similar value between the text document and the classifying catalogue; and classifying and sequencing the text document according to the similar value between the text document and the classifying catalogue. By utilizing the method of the invention, the text document can be automatically classified, and the accuracy of the text document classification can be improved.