The invention relates to a network management centralized management method and a server. The network management centralized management method comprises steps: user account information of a network management system is acquired; according to the user account information, a user account logging in to a network management centralized management server is verified to acquire a network management permission for the current user account; and corresponding network management operation is executed according to the network management permission. While one or multiple physical sets of original networkmanagement systems does or do not change in any form, operation management on sub network management can be realized according to a predetermined network management system mapping relationship, smoothexpansion can be realized conveniently, and operation management on other sub networks is not affected after expansion; increasing or small increasing of servers is not needed, the system can be deployed in one main server in multiple physical sets, and resources existing in the set of system are used for configuration. The disaster-tolerance ability of the network management centralized management server can be effectively improved, and when network management on any sub network fails, use of network management on the whole network is not influenced.