Abstract: Objective: Metro vehicle depot lighting system currently faces problems of difficult maintenance and complex construction caused by the ceiling installation height and the OCS (overhead catenary system) below. Additionally, there are problems including energy waste caused by the lack of dimming capabilities of common AC LED (light emitting diode) lighting fixtures, the poor power quality of smallpower distributed rectifier circuits and difficult communication pipeline layout and debugging of common AC LED lighting fixtures. Thus intelligent DC centralized power supply lighting technology is applied to vehicle depot lighting. Method: The conventional AC distribution box is replaced by an intelligent DC centralized power supply cabinet, which integrates centralized rectification, circuit distribution, and intelligent lighting control functionalities. The largepower centralized rectification is used instead of the conventional AC LED smallpower distributed rectification. At the same time, DC power carrier is used as the communication control scheme from the power supply cabinet to the lighting fixtures, reducing the need for communication control lines. The rectification module outputs voltagecoupled ripple signals to issue control commands, thereby achieving DC power carrier communication. Result & Conclusion: By adopting the intelligent DC centralized power supply lighting solution, the need for lighting communication lines is reduced, stable and reliable intelligent dimming control is achieved, the power quality of the DC cabinet is improved, the power factor of the AC power supply side is increased, together with the decrease of the threephase current imbalance and the harmonic content of the power grid, the comprehensive efficiency of the lighting system is improved. Conclusion: Actual operation data show that the application of intelligent DC centralized power supply to metro vehicle depot lighting has solved the problems of ceiling lighting, slightly reduced equipment costs, significantly reduced maintenance rates, achieved obvious energysaving effects, and improved the utilization of electric energy, demonstrating good promotion significance.