In the low-voltage rail powered transfer trolley, the track sliding contact line is used for power supply. The ground step-down transformer will step-down the AC 380V power supply to AC 36V, connect two rails respectively, and introduce the electric box on the vehicle through the track. The step-up transformer will boost AC 36V to 380V. Start, stop, forward, the back and speed of the transfer trolley are controlled by the inverter through the AC control system.