The invention relates to a short text data enhancing method. The method includes following steps: acquiring a short text document set, opening all documents in the short text document set, and readingtext content of each document; respectively transmitting the text content as a text data enhancing item into a temporary storage region; respectively writing each text data enhancing item in the temporary storage region into the corresponding document. According to the method, by reading the text content of the documents, transmitting the text content as the text data enhancing items into the temporary storage region and writing the text data enhancing items into the documents, under the circumstance that external information is not cited, own data information is utilized to increase text length, enhance theme information and effectively improve theme quality, so that the problem that the theme information cannot be understood deeply due to the fact that the text content is too little andtext sparsity is too high is relieved, and text theme mining is facilitated.