A visible light communication (VLC) technology based on light-emitting diode (LED), which integrates the dual functions of lighting and data communication, is becoming a hot topic of wireless communication research. Deficient modulation bandwidth of commercial LED limits the development of high speed transmission of VLC system. In order to solve the problem, a hardware pre-equalization technology is proposed to extend the -3 dB modulation bandwidth of VLC system effectively, and the transmission rate of VLC system is improved. The development progress and the application status both at home and abroad of hardware pre-equalization technology used in high-speed VLC system are summarized. The comparison of equalization control strategy, equalization circuit structure and equalization effect of different pre-equalization plans is carried out. The research trend of equalization technology is made, which provides a reference for the research of high-speed VLC technology in the future.