The invention belongs to the field of control over electric appliances, and provides a power source automatic docking device for automatic charging of a wheeled robot. The power source automatic docking device for automatic charging of the wheeled robot comprises a hung feed device and a vehicle-mounted powered device. The feed device comprises a motor, a lead screw, a sliding block, a sliding rail, a left limiting switch, a right limiting switch, a wire hanging rod, a hanging ring, a power line, a special power socket, a hanging spring, a hanging steel wire and a wireless controller. The powered device comprises a motor, a lead screw, a sliding block, a sliding rail, a supporting seat, a comb-shaped mechanical hand, an electrode inserting groove, a front limiting switch, a rear limiting switch and a docking controller. The automatic operation process of the automatic docking device simulates the power source docking behavior of people, is high in adaptability, accurate and high in reliability. As long as the wheeled robot is parked in an appointed area, even though front-back, left-right and height deviation exits, accurate control over taking, plugging in and pulling out of electrodes can all be achieved, and the complete process of power source automatic docking-separation is finished.