Abstract: The power supply control system using PLC includes a repeater for recognizing a remote control signal transmitted by a remote control signal transmitter and an ID number of a corresponding electronic equipment to remote control signal transmitter and an ID number of a corresponding electronic equipment to remotely turn on/off at least one of many electronic equipments, a power line signal transmitter for converting the ID number and the remote control signal into a data signal and interfacing with a power line signal of AC power to transmit the data signal, a power line signal controller having a PLC unit for isolating the data signal from the power line signal of AC power and converting the data signal into a digital signal, and a relay integrated with the controller in the electronic equipment to control a power source toward the electronic equipment by connecting/disconnecting a power source terminal to/from a load terminal by control of the controller and connected to the PLC unit.