The invention provides a method for extracting repeated strings facing meaningful string mining and a device. The method comprises the following steps: A. preprocessing corpus; B. extracting repeated strings; and C. trimming the repeated strings. The device comprises a corpus preprocessing module, a repeated string discovery module and a repeated string trimming module. The repeated strings extracted by the invention can be further analyzed to obtain meaningful strings, which can be widely used for network public feeling management, internet intelligent information processing and other application fields.