The invention discloses an information extraction method for text data, which comprises the following steps of: according to context character data of characters in the obtained text data, labeling part-of-speech of the characters contained in the text data, and determining the text data containing the part-of-speech labeling of the characters; extracting a relational phrase in the text data containing the character part-of-speech tagging to generate a phrase seed template; matching the text data containing the character part-of-speech tagging with the phrase seed template, determining phrases, matched with the phrase seed template, in the text data, and generating structural data containing a corresponding relation between the matched phrases and the phrase seed template; and calculatingthe credibility of the phrase seed template in the structure data, and outputting the phrase seed template of which the credibility is greater than or equal to a set credibility threshold value. The invention further discloses a text data information extraction device and a computer readable storage medium.