The invention provides a method for automatically generating a main character abstract in a television program. According to the method, image characteristics and an unsupervised clustering method in a video are combined, so that main characters in a program video are extracted, an interviewer and an interviewee are marked, and a preview of the main character abstract is generated; and therefore, the user experience is enhanced. The method comprises the following steps of: extracting a key frame at a uniform time interval based on a video paragraph with marks, performing face detection and characteristic extraction, performing linear clustering on face images based on characteristics, obtaining rough character classifications according to time information and space information of the face images, obtaining a precise clustering result through graph-theory-based clustering, filtering the main character classifications of independent paragraphs by an adaptive method, integrating filter results of all the paragraphs, secondarily performing the graph-theory-based clustering, judging the interviewer and the interviewee according to a rule, and marking and generating the main character abstract of each paragraph. By the unsupervised clustering method, the structure is simple, and the method is easy to implement; and the method is relatively high in universality and robustness.