The invention discloses an information mining method and device. A specific implementation way of the method comprises the following steps: carrying out sentence segmentation on obtained text information to obtain a sub-sentence set; selecting at least one candidate sub-sentence from the sub-sentence set according to the preset public opinion word set; carrying out word segmentation on the at least one candidate sub-sentence on the basis of a domain dictionary, carrying out dependency parsing on various words obtained after word segmentation to obtain at least one candidate word collocation pair; selecting at least one word collocation pair from the at least one candidate word collocation pair as a first word collocation pair set mined from the text information according to the public opinion word set. The implementation way achieves rapid and accurate information mining.