The invention discloses a northbound-interface-based subsystem independent hot rebooting method and device. The method comprises the steps that each protocol service subsystem loads a network administration interface and registers a message notification, and different protocol service subsystems run independently; data communication is carried out on each protocol service subsystem and a network administrator through the network administration interface provided by a network administration interface layer; a starting module calls starting parameters of the protocol service subsystems, and the protocol service subsystems are restarted. The network administration interfaces are administrated in a unified mode, then, the functions of the protocol service subsystems are independently extracted, and each protocol service subsystem can be independently started or stopped; during starting or stopping, independent resource administration modules are called, and resources being used or needing to be used are administrated in a unified mode. The restarting process of the single protocol service subsystems in a northbound interface system is more efficient, stable and easy to manage and maintain, and loads of the network administration system are lowered.