The present invention discloses a method for constructing a public opinion knowledge map based on hot events, and belongs to the field of natural language processing. The method comprises: obtaining microblogging texts in real time, processing each microblogging text, constructing text clusters, calculating a topic category to which each text cluster belongs, identifying hot events in each clusterby category, and collecting statistics of multi-dimensional attributes of each hot event; identifying key people and organizations involved in the discussion of the hot events and obtaining the multi-dimensional attributes of the key people and organizations; and constructing a multi-dimensional attribute system and a relationship type among events, people and organizations, taking the relationship among the events, people and organizations as association, and constructing a public opinion knowledge map. According to the method disclosed by the present invention, the hot events, people and organizations can be described from multiple dimensions, and all-directional analysis of hot events, people and organizations can be implemented; and according to the actual needs, the weight of different topic categories can be set, and construction of the public opinion knowledge map of different topics can be realized.