The invention relates to a control circuit for a full-automatic cleaning robot. An MCU (micro controller unit) control circuit is adopted as a core. A barrier monitoring circuit, a falling detection circuit, an air-sounding signal modulation circuit, an air-sounding signal processing circuit, a left wheel driving circuit, a right wheel driving circuit, a dust-collection driving circuit, a side-brush driving circuit, a key circuit, a sound prompting circuit, a display circuit, a light detecting circuit, a motor speed measuring circuit and an infrared remote signal receiving circuit are connected on the MCU control circuit. The working voltage of the whole control circuit is supplied by a chargeable battery pack on which a charging control circuit, a battery pack charging temperature detecting circuit and a battery under-voltage monitoring circuit are connected. The charging control circuit, the battery pack charging temperature detecting circuit and the battery under-voltage monitoringcircuit are also connected with the MCU control circuit. The control circuit can effectively avoid overcharging, ensure safety and prolong the service life of a battery pack by detecting the temperature of the battery pack; meanwhile, when a motor is blocked in rotation, the control circuit can stop the working of the motor so as to prolong the service life of the motor.