The invention provides a method for generating a microblog timeline based on dynamic clustering. The method comprises the following steps of obtaining a plurality of microblogs related with a given topic; obtaining the similarity of the multiple microblogs, and according to the similarity of the multiple microblogs, building a relational graph of the microblogs; according to the relational graph of the microblogs, classifying the microblogs by a clustering algorithm, and selecting a representative microblog from each type of microblogs; according to the publishing time, sequencing all the representative microblogs, and generating the microblog timeline. The invention provides a device for generating the microblog timeline based on the dynamic clustering. The device comprises an obtaining unit, a microblog relational graph building unit, a dynamic clustering unit and a timeline generating unit. The method and the device have the advantages that the redundant microblogs and noise microblogs can be effectively filtered, and a microblog retrieval system with stronger robustness and a better retrieval effect is built.