Information interaction method, device and system

The invention discloses an information interaction method, device and system, and the information interaction method, device and system are used for solving the problem of various types of information interaction across systems and platforms. The method mainly comprises the steps that a corresponding relation between first user information of a first server and second user information of a second server is set up, and the second user information of the second server identifies an authentication key in an information code sent by a client side, then second user identity information is sent to a first server address in the information code; according to the processing types, the second user information and/or webpage are/is numbered for processing. The method which is universal and conveniently processing information interaction across platforms is provided for users, and the requirement for various types of user interaction can be met.