The invention relates to a method for searching a conversation message. The method comprises the following steps of a setting step, i.e. setting a search condition of a backup conversation record, wherein the backup conversation record corresponds to a current logging user and a conversation target of an instant messaging tool; a sending step. i.e. according to the search condition, generating a research request of the backup conversation record, sending the research request to a server, and after the server receives the research request, searching one or more target conversation messages in accordance with the search condition from the backup conversation record; a displaying step, i.e. acquiring and displaying the target conversation messages. The invention also provides a device and a system for searching the conversation message. By the method, the device and the system, the hit rate of searching for the required conversation message can be improved, and data traffic is saved.