The invention discloses a business system, and a data recovery method and device, and belongs to the field of the network technology. The system comprises a log management server, a business internal server, a business external server and message middleware, wherein the log management server is used for receiving business data sent from the business external server, and generating a business log according to the received business data; the log management server is also used for comparing the business log maintained by the log management server with business data in an internal service database; and when the business log is not in the presence in the business data maintained by the business internal server, the business log is written into the internal service database. By use of the system, on the basis of an original business system, the log management server is additionally arranged, and therefore, the system provided by the embodiment of the invention can automatically recover lost data when the system is subjected to data loss.