The invention belongs to the technical field of nuclear power plants, and specifically relates to a maintenance telephone system meeting use demands of a domestic nuclear power plant. The system comprises a maintenance telephone system host, an emergency transfer box, wall-mounted communication sockets, a portable maintenance telephone terminal, and a cable dividing box. All subscriber lines of the maintenance telephone system host and all emergency loop lines of the emergency transfer box are connected to a wire distribution strip, and then are connected to the cable dividing box through a user cable. Each pair of subscriber lines in the cable dividing box are connected to normal mode jacks of each wall-mounted communication socket in a star-shaped manner. The emergency loop lines in the cable dividing box enable the emergency mode jacks of all wall-mounted communication sockets in the emergency loop to be connected in parallel in a bus mode through telephone lines. The portable maintenance telephone terminal is connected with the normal mode jacks or emergency mode jacks corresponding to the wall-mounted communication sockets in working modes (normal mode or emergency mode), thereby completing the connection for communication.