The utility model provides an unmanned aerial vehicle's battery replenishing device, includes the battery, inflate ring, an electric putter, third motor, second motor, wheel, pump, crashproof board, the 2nd electric putter, paddle, frame, controller, first motor, rope, wireless charging base and wireless rechargeable receiver, frame each side installation second motor, the output shaft of second motor passes through the shaft coupling and links to each other with the wheel, and the paddle is installed outside stretching out the frame to installation third motor in the frame, the output shaft of third motor on the output shaft of third motor, and the circle is inflated to the car shelf location, inflates the circle and links to each other through pipeline and pump, and the pump is installed on the frame, and the rope upper end is installed and is circled inflating, the utility model has the advantages that: it charges when flight to enable unmanned aerial vehicle.