The invention provides a method and system for realizing routing cascade networking of an LTE broadband cluster system. The method for realizing the routing cascade networking of the LTE broadband cluster system comprises the following steps: after a calling terminal and a called terminal establish a signaling connection, an integrated base station receives an uplink message sent by the calling terminal; the integrated base station sends the uplink message to a cluster scheduling server through a switch; the cluster scheduling server performs scheduling processing on the uplink message, and sends the processed uplink message to an LTE wireless router through the switch; and the LTE wireless router sends the processed uplink message to the integrated base station of an upper level LTE broadband cluster system, so that the integrated base station of the upper level LTE broadband cluster system sends the uplink message to the LTE broadband cluster system to which the called terminal belongs. By adoption of the method and system provided by the invention, the interconnected communication of a plurality of LTE broadband cluster systems is realized.