Provided is a cannula to more rapidly and efficiently accelerate the suction of the fat from a human body. The cannula has an empty space therein and a pipe shape to suck a fat in a skin. The cannula includes a handpiece coupled with a rear end coupled with the cannula, and a control box including a micro-controller and a power supply. First and second RF electrode plates are provided at an outer portion of an inner insulator in opposition to each other. A temperature sensor is interposed between the first and second RF electrode plates, and an outer insulator is formed on an outer peripheral portion of the first and second RF electrode plates and the temperature sensor. The first and second electrodes are alternately wound in a spiral shape around an inner insulator of the cannula and spaced apart from each other by a predetermined interval.
