In order to reduce the complexity and improve the stability of indoor power line communication and visible light communication(PLC-VLC) systems, an improved PLC-VLC hybrid network system based on orthogonal frequency division multiplexing(OFDM) is proposed. By improving the structure of dual PLC modulator and light emitting diode (LED), the complexity of traditional hybrid network system is reduced. The simulation platform of PLC-VLC hybrid system is built, and the performance of signal spectrum, eye map and bit error rate are simulated and analyzed. The simulation results show that the proposed improved PLC-VLC hybrid network system based on OFDM has no distortion in the conversion of electrical signal and optical signal, high signal transmission accuracy and good system performance.