The invention discloses a method for grinding the shells of traditional Chinese medicine and a traditional Chinese medicine shell grinding machine. According to the method, traditional Chinese medicine shells are delivered to a conveyor belt and move along with the conveyor belt; during the movement process, the shells are extruded and grinded by a plurality of sets of pressing wheels, which are vertically and oppositely arranged; and by adjusting the distance between the pressing wheels, traditional Chinese medicine fragments with a required size can be obtained. The traditional Chinese medicine shell grinding machine for realizing the method mentioned above comprises an obliquely arranged body; a conveyor belt, which delivers objects along the inclination direction, is arranged in the body; two sets of pressing wheels are arranged above and under the surface of the conveyor belt respectively; by adjusting the distance between upper pressing wheels and lower pressing wheels, the sizeof traditional Chinese medicine fragments can be controlled, the damage to the shells is reduced, the yield is increased, moreover, the structure of the grinding machine is simple, the steps are few,and the processing speed is quick.