A technical scheme of the invention discloses a method for obtaining a text classifier used for automatic corpus tagging, and the text classifier. The method comprises: determining a concept set, using a concept keyword corresponding to each concept to match a non-tagging corpus text and perform automatic tagging processing, the concept keyword being in a concept keyword set; for each concept, when the number of texts in a tagging corpus text set corresponding to the concept meets a threshold condition, training a corresponding text classification model for the concept, to obtain a corresponding text classifier, and finally a text classifier set corresponding to the concept is obtained, all text numbers meeting the threshold condition. The invention provides an algorithm structure having universality, and a classification system is flexibly changed, calculation time and resources are saved. The text classifier just needs few initial corpus texts, and the text classifier automatically tags without manual tagging, so as to further save time and cost.