The embodiment of the invention discloses a data storage method, device and facility. The data storage method comprises the steps that when query response data packets retuned by a lower-layer onlinemodule to an upper-layer online module is obtained, data storage numbers corresponding to the query response data packets are calculated; if it is determined that data in the query response data packets is not stored in an external storage space according to the data storage numbers, the data in the query response data packets is stored in the external storage space. By adopting the technical scheme, the problem is solved that an existing distributed storage system cannot meet the use demand for asynchronously and persistently storing data packets communicated among online system modules on aspecific application scene on the premise that online services are not affected, an existing data storage technology is optimized, and the demand for asynchronously and persistently storing data on the specific application scene is met.