The invention discloses a load balancing system for realizing cross-regional cluster scheduling, which comprises a plurality of load balancing clusters and a shared session pool, and is characterizedin that the load balancing clusters for processing load-bearing services are marked as first clusters, and the rest load balancing clusters are marked as second clusters; When any load balancing cluster is configured to process the bearing service, a session state of the bearing service to a shared session pool for storage is sent; And when the first cluster is abnormal, the second cluster reads the session state in the shared session pool according to the abnormal processing configuration information, and processes the subsequent service carrying the service. Through the technical scheme provided by the invention, the rapid switching of the bearer service between the cross-regional load balancing clusters is realized, so that when a single load balancing cluster is abnormal, the bearer service can be migrated to other load balancing clusters, and the reliability and the stability of processing the bearer service are improved.