An automatic charging system of a w

An automatic charging system of a walking robot for a network game is provided to mount a charging terminal on the bottom of the foot of the robot and install an electrode used to supply power on the floor of a stadium. An automatic charging system of a walking robot includes a rectifier(310), a switching part(320), an over-charge preventing part(330), an over-voltage preventing part(340), and a first current/voltage controller(350). The rectifier rectifies current applied to the walking robot. The switching part controls the switching for an output of the rectifier according to a first control signal output from the first current/voltage controller. The over-charge preventing part checks an output current of the rectifier and outputs the check result to the first current/voltage controller. The over-voltage preventing part checks an output voltage of the rectifier to output the check result to the first current/voltage controller. The first current/voltage controller outputs the first control signal to control the switching operation of the switching part