The invention discloses an initiative permission method for a server, a network control system and a controlled terminal. Occurrence of wrong interruption carried out on server business by the networkcontrol system can be eliminated. The method comprises the steps that the network control system and the controlled terminal are started in sequence, and when the controlled terminal carries out detection to know that a plug-in is installed in the controlled terminal and the plug-in detects that an IP of the controlled terminal is not changed, the controlled terminal accesses a network; after thenetwork control system monitors network access data of the controlled terminal, the network control system judges whether the plug-in is installed in the controlled terminal or not by querying an information report record of the controlled terminal, according to the network access data; if the plug-in is installed in the controlled terminal, the network control system judges whether the controlled terminal is a server or not by querying the information report record of the controlled terminal according to the network data; and if the controlled terminal is the server, the network control system permits network access of the controlled terminal.