The invention provides a DHT (Distributed Hash Table) network load balancing device and a dummy node dividing method. The DHT network load balancing device comprises a node storage capacity collection device, a node bandwidth collection device, a node ID region collection device, a node performance evaluation device, a node neighbor set collection device, a node joining device and a node leaving device. The dummy node dividing method comprises the following steps of: (1) joining a network by nodes: the nodes define the grades per se through a performance model, and if the nodes are weak nodes, adjacent weak nodes are found out; (2) merging the nodes: the nodes leave the network and establish a connection with the adjacent weak nodes which are found out so as to form a strong dummy node, the leaving nodes interact with other nodes in a system through the adjacent weak nodes, and other nodes consider the leaving nodes to be part of the strong dummy node; and (3) adjusting merged nodes. Only an ID containing the strong dummy node is inquired after the nodes are merged, and the strong dummy node distributes the load of each weak node so as to achieve load balance.