Abstract: Signal is one of the three important equipment in traditional signal system. XDZ-B type multifunction lighting device was taken as the signal operation unit, its reliability and safety would inference the whole signal system directly. In order to test different performance criteria of signal lighting device regularly and improve testing accuracy, for the convenience of operation staff, a testing platform for XDZ-B type multifunction signal lighting device was designed. This platform could be used to sample electric parameters of signal lighting device by isolation method, simulate all kinds of typical equipment fault, work automatically with good data consistency and high data accuracy. The platform has been used in Nanjing Metro to detect the fault points of the signal lighting device and quickly filter the signal lighting device with reduced performance. It has a positive meaning to reduce the failure rate and improve the maintenance efficiency.