The invention discloses an offline cache method and device. The method comprises the steps that a resource downloading request is initiated according to a command of a user terminal; the resource downloading request is intercepted, and the identifier of a downloaded resource is parsed from the resource downloading request; according to the identifier, whether a resource corresponding to the identifier exists in the local database is judged; when the resource exists, the resource in the local database is packaged and the resource downloading request is responded, so as to complete resource downloading. According to the invention, a lot of network flow can be saved for a user terminal; under the condition of a smooth network, the desired network resource can be requested and stored into the local database, and the request time can be greatly reduced; in an adverse network environment, history resources can be browsed from the local database; repeated downloading of the same resource is prevented; and the performance of the user terminal is enhanced.