A universal modular connector of the present invention mainly includes a base and a transforming module. The base has a first slot. A connecting socket is arranged in the base. The connecting socket has an opening and a plurality of conductive pins protruding out from the base. The transforming module has a circuit board, an optical component electrically connected to the circuit board, a signal transforming integrated circuit, and a plurality of conducting terminals. The transforming module is arranged in the first slot of the base. The conducting terminals are electrically connected to the conductive pins in the opening. The optical component receives an optical signal from an external wire, the signal transforming integrated circuit transforms the optical signal into a corresponding electronic signal, and then the electronic signal is transmitted to the conductive pins.