Detachable grinding and sieving unit

The utility model discloses a detachable grinding and sieving unit, and belongs to the technical field of grinding and processing. The detachable grinding and screening unit provided by the utility model comprises a mortar, a grinding bar, a unit sample containing system and a unit sieving system; the grinding bar is of in solid structure; the unit sample containing system is in a hollow structure; the unit sample containing system is composed of a sample containing chamber I and a sample containing chamber II; the inner diameter of the sample containing chamber I is slightly greater than the inner diameter of the sample containing chamber II; a protrusion is formed at the connection part of the inner diameter of the sample containing chamber I and the inner diameter of the sample containing chamber II, and is provided with a mesh II; the inner wall of the sample containing chamber II is provided with a thread; the surface at one end of the grinding bar is provided with a thread; the inner wall of the sample