The utility model discloses a coaxial-cable unshielded-twisted-pair optical-fiber hybrid-networking intercom system, and the intercom system comprises a plurality of indoor units, a plurality of floor distributors, a plurality of unit entrance machines, an optical fiber exchanger, and a management center. The indoor units are electrically connected with the floor distributors through an unshielded twisted pair. The floor distributors are electrically with the optical fiber exchanger through an optical fiber. The optical fiber exchanger is electrically connected with the management center through a coaxial cable. The unit entrance machine is electrically connected with the floor distributors through a coaxial cable. According to the utility model, the indoor units are electrically connected with the floor distributors through the unshielded twisted pair, thereby reducing the cost of the circuit materials. The floor distributors are electrically connected with the optical fiber exchanger through the optical cable. The optical-fiber transmission mode is employed, thereby enlarging the control range of the management center, enabling the telecom system to be suitable for a large-scale community and a far residence community in each district.