The invention discloses a data exchange system, method and device. The system comprises first and second servers; the first server obtains a to-be-exchanged data identification on the basis of demand information, stores the to-be-exchanged data identification, obtains a storage address of the to-be-exchanged data identification, and encrypts the storage address of the to-be-exchanged data identification to generate a first encrypted storage address; and the second server obtains the first encrypted storage address from the first server, decrypts the first encrypted storage address to obtain the storage address of the to-be-exchanged data identification, obtains the to-be-exchanged data identification on the basis of storage address thereof, and on the basis of the to-be-exchanged data identification, searches a pre-stored data set for to-be-exchanged data indicated by the to-be-exchanged data identification so that the first server obtains the to-be-exchanged data from the second server. Thus, the construction and maintenance cost of the data exchange system is reduced.