The invention discloses an automatic book keyword generation method. The relation between a book and an author thereof is determined, book reviews are collected from the Internet and dismantled into words, which are tagged with parts of speech, and nouns are kept as alternate keywords; the number of documents with the alternate keywords appeared in Wikipedia is retrieved by Google in order to preliminarily assesses the importance, and modal particles and wrongly written words are filtered; a four-step map is constructed with the author, the book, the review and the alternate keyword as four types of nodes and the relations between the author, the book, the review and the alternate keyword as sides; and based on the four-step map, an absorbing-state random walk algorithm with the book as a center is applied to select the most important alternate keyword as a book keyword. The invention takes the subject consistency, content correlation and reader feedback of the books of the same author into consideration, so the accuracy rate of the keyword is high; the book reviews of readers from different perspectives are sufficiently covered, and the keyword is diversified; data comes from the Internet, the number of book reviews is enormous, coverage is wide, and the coverage of the method is wide.