In order to deal with the spectrum crisis of the new generation of communication technology, according to the physical phenomenon of overlapping area between quantum well diode emission spectrum and detection spectrum, and a single channel full duplex visible light communication system based on GaN integrated optoelectronic chip is proposed. A pair of blue light and green light gallium nitride quantum well diode devices with the same quantum well structure are used as optical transmitter and optical receiver, respectively. The devices are integrated with TiO2/SiO2 distributed Bragg reflector(DBR). Incident light and emitted light are isolated to realize single-channel full-duplex optical communication. The test results show that the visible light communication system can save the channel space through the integration of gallium nitride optoelectronic chip, which is of great significance for the development of future 6G visible light communication technology.