A self-propelled conveying system with a capacitor and a secondary battery as power supply reuses regenerated power and restrain stopping precision deviation of a self-propelled conveying tool. A bidirectional DC-DC converter is connected between the capacitor and a driving control device. The self-propelled conveying system is provided with the following components: a control circuit which switches off a switch when the output voltage of the capacitor is above the output voltage of the bidirectional DC-DC converter, switches on the switch when the output voltage of the capacitor is lower than the output voltage of the DC-DC converter, converts the DC-DC converter to a regeneration side when the output side voltage of the DC-DC converter is above a regeneration starting setting voltage, and switches the DC-DC converter to a power operation side when the output side voltage of the DC-DC converter is below the regeneration finishing setting voltage; and a rectifying mechanism which is connected between the battery and the secondary battery so an electric current is generated from the secondary battery side to the driving control device, and no electric current is generated in an opposite direction.