Method and device for filtering junk files based on key words

The invention provides a method and a device for filtering junk files based on key words. The method comprises steps of acquiring a Chinese file to be detected, converting Chinese characters of the Chinese file into spelling characters, obtaining a spelling file, matching the spelling file in accordance with spelling corresponding to Chinese key words, and determining that the Chinese file to be detected is a junk file if spelling characters in the spelling file is matched to the spelling corresponding to Chinese key words. A spelling key word can correspond to a plurality of Chinese key words, the number of key words is reduced, the matching efficiency of key words is improved, spelling key words can correspond to other Chinese key words which are not listed in Chinese key words and have the same homophony with Chinese key words, and the distinguishing efficiency of junk files is improved.