The invention discloses a graphite carbon rod cutting device. The graphite carbon rod cutting device comprises a first mounting plate, a second mounting plate, a first rolling shaft, a second rollingshaft and a cutting knife; supporting legs are fixedly welded to the four corners of the first mounting plate and the second mounting plate, a rotating shaft rod, the first rolling shaft and the second rolling shaft are arranged between the first mounting plate and the second mounting plate from left to right, a transmission belt is arranged on the first rolling shaft and the second rolling shaft,a second groove wheel is fixed to the end, where the rotating shaft rod turns, of the second mounting plate, a second fixed plate is fixed to the side edges of one set of supporting legs of the second mounting plate, a servo motor is arranged on the second fixed plate, a rotating wheel is arranged on the front end of a motor shaft of the servo motor, and a belt is connected between the rotating wheel and the second groove wheel. The graphite carbon rod cutting device is reasonable in design, and capable of effectively fixing a carbon bar, meanwhile, according to the size and the length of thecarbon, the cutting device is adjusted, and the device is suitable for use and popularization.