The application provides an information pushing method and device and a communication system. The method comprises the steps of: searching login information of target client equipment from a data caching layer, wherein the login information comprises an identifier of connection management equipment and a first timestamp of the connection management equipment, the first timestamp is used for identifying a moment at which the connection management equipment is started latest before a moment at which a connection is established between the target client equipment and the connection management equipment; acquiring a second timestamp which is recorded by a server and corresponds to the identifier, wherein the second timestamp is used for identifying a moment at which the server monitors out startup of the connection management equipment latest; and when the first timestamp is inconsistent with the second timestamp, refusing to push information to the connection management equipment. By the technical scheme of the application, a problem that the server is failed to deliver a message to the connection management equipment after the connection management equipment is restarted can be avoided.