A battery charging station, for a robot, includes a base, two side-walls barriers, a stop, a supporting arm, a charging connector, and a transmitter. The side-walls barriers are separately mounted on the base. The stop is mounted on the back of the base to form a docking space together with the barriers and the base. The supporting arm is cantilever mounted on the stop by one free end thereof with the other end extending into the space over the docking space. The charging connector is mounted on the free end of the supporting arm and is configured for providing an electrical connection between the robot and a power source. The transmitter is positioned on the upper surface of the supporting arm and is configured for emitting signals for the robot to locate the re battery charging station.