With the continuous development of the research in visible light communication system, it is highlight to solve the problem of lacking uplink communication. The bi-directional visible light communication system means that both ends of the system need to realize photoelectric conversion and electro-optical conversion at the same time. In this paper, we propose a real-time bi-directional visible-light communication system scheme with light-emitting diodes (LEDs) as both optical signal transmitter and receiver, in which we design the mechanism of controlling LED bi-directional work by the way of time-division multiplexing to achieve a bi-directional visible light communication. The real-time bi-directional communication system experiments are done under the different elevation angles of transmitter and receiver. The results show that the system scheme can realize real-time bi-directional visible light communication at a distance of more than 2 m and a transmission rate of 8 Mb/s only with LED as optical transmitter and receiver, without strict alignment and relaying amplification.