A charging system includes a robot and a charging apparatus. The robot includes a rechargeable battery, a power receiving terminal electrically connecting with the rechargeable battery, and a detector for detecting a voltage of the battery. The charging apparatus for charging the robot includes a base comprising a receiving portion defining a sliding slot, a power supplying terminal disposed in the receiving portion and configured for electrically contacting with the power receiving terminal, a positioning board docked in the receiving portion for loading the robot, and a driving device including an inclined surface contacting with the positioning board via the sliding slot. The detector may send a control signal to the driving device to push the positioning board with the robot up from the receiving portion.