The invention provides a method and a system for screening and evaluating earthquake emergency information in a social network. The method comprises the steps of obtaining the earthquake emergency information in the social network, performing word segmentation processing on the earthquake emergency information through an NLPIR Chinese word segmentation system, and filtering the earthquake emergency information through a topic word bank; classifying the filtered earthquake emergency information by using a classifier; and according to an information evaluation index system, performing credibility evaluation and criticality evaluation on the classified earthquake emergency information. According to the method provided by the invention, a large amount of the earthquake emergency information isfiltered and screened and is classified, and the credibility and criticality of the information are evaluated, so that valuable emergency information in the social network can effectively serve disaster situation study and judgment and rescue guarantee, and the timeliness and accuracy of earthquake disaster emergency services are improved.