The invention discloses a recording method and device of a live broadcast video, and belongs to the technical field of networks. The recording method comprises the steps that dynamic evaluation parameters of a target live broadcast room are determined, wherein any one live broadcast room in multiple live broadcast rooms conducting network broadcasting at present serves as the target live broadcast room, and the dynamic evaluation parameters are used for measuring dynamic information of the target live broadcast room; whether the dynamic evaluation parameters meet the preset condition or not is judged, and if yes, the live broadcast video during network broadcasting in the target live broadcast room is recorded. Accordingly, when it is detected that the dynamic evaluation parameters of the target live broadcast room meet the preset condition, the live broadcast video is automatically recorded by a network live broadcast platform without needing manual operation of a user, and therefore the operation convenience is improved.