The utility model discloses a rubber cutting device of rubber mixing roll, rubber cutting device of rubber mixing roll contain a drive shaft, drive shaft on be equipped with a detachable fixed bolster. The utility model discloses a rubber cutting device of rubber mixing roll's advantage is: during the use, the user can recycle the position of adjusting the notch and fine controling the cutting blade disc according to the next azel that sets up of tentatively adjusting the fixed bolster of the thickness of film, and it is convenient to adjust, and the precision height has improved the precision of the rubber cutting of rubber mixing roll greatly, simple structure, and the practicality is strong.