In the real-time transmission of audio and video in visible light, the system requires high speed. In order to reduce the transmission rate, video data and audio data are collected by field programmable gate array(FPGA) modulation module at the transmitting end, and then loaded into the corresponding light emitting diode(LED) driver circuit, the light from two LEDs is projected to the photodetector at the same time, and the receiving end separates the audio data and video data according to the intensity of the voltage signal after the photoelectricity conversion, and transmits them to the corresponding terminal. Experimental results show that the system can transmit real-time audio and video at a relatively low transmission rate.