The invention provides a term weight generation method and device. The term weight generation method includes: acquiring a query string to be treated; performing segmentation processing on the query string to be treated to obtain a segmented term to be treated; combining the segmented term and a sequence of the consecutive multiple segmented terms to be treated to form a set of term fragments to be treated; acquiring a pre-training term weight of the segmented term to be treated relative to each term fragment containing the segmented term; and calculating a fitting term weight of the segmented term to be treated relative to the query string to be treated according to the acquired pre-training term weight. The term weight generation method and device take the term weight of each term of the query string to be treated in the query string to be treated, and can accurately reflect the search requirements of a user; a search result is sorted through the fitting term weight, and then the search result is more close to the search requirements, and the accuracy and the efficiency of search are improved.