A liquid level adjusting device for a regenerating tower comprises an electric valve device, a screw rod, a lifting barrel, a slide rod, a slide rail, an electronic liquid level meter and the like. The electric valve device is connected with the lifting barrel through the screw rod and mounted in a liquid level adjustor shell, and the whole liquid level adjusting device is positioned at the top of the regenerating tower of a devulcanization system. The electronic liquid level meter is positioned on the outer side of the tower wall of the regenerating tower, the slide rail is positioned on the U-shaped inner wall of the adjustor shell, and the slide rod is positioned in the center of the outer wall of the lifting barrel. The slide rod and the slide rail of the liquid level adjusting device are used for preventing the lifting barrel from rotating along with the screw rod when the electric valve device drives the screw rod to rotate, and the lifting barrel cannot ascend or descend. Actual devulcanization liquid level is detected by the liquid level meter, and a monitor starts the electric valve device and controls the same to rotate positively and reservedly to drive the lifting barrel, so that automatic adjustment of the liquid level of the regenerating tower is realized. Precise analysis can be performed according to monitoring results, analysis results can be fed back to the electric valve device to control the devulcanization liquid level of the regenerating tower and control foam generation volume, and accordingly devulcanization effect can be effectively improved.