The embodiment of the invention discloses a data storage method and device. The method comprises the following steps that when a processing request, on multimedia data, of a user terminal is detected, the multimedia data stored in a first storage side is sent to the user terminal, so that the user terminal carries out service processing on the multimedia data; when the processing completion feedback information, on the multimedia data, of the user terminal is received, the multimedia data is marked as data to be unloaded; when the condition that a storage space of the first storage side reaches a preset value is detected, the data to be unloaded is converted into archiving data; the archiving data is stored into a second storage side, and in addition, the data to be unloaded is deleted from the first storage side. The data inquiry speed can be accelerated, and the service processing efficiency is improved.