The invention discloses a miniature
combine harvester which is good in harvesting quality. The miniature
combine harvester comprises a body and a cleaning mechanism arranged on the body. The miniature
combine harvester is characterized in that the cleaning mechanism comprises a
cyclone separator arranged on the combine harvester, a shell of the
cyclone separator is divided into a cylindrical part and a conical part from top to bottom in the axial direction, and
helical impellers are axially arranged inside the
cyclone separator; a vertically-upward air outlet and a transverse feed port are formed in the cylindrical part, a
discharge port is formed in the lower end of the conical part, and vent holes are formed in the shell wall, close to the
discharge port, of the conical part; the feed port is connected with an output port of a
threshing device, and the air outlet is connected with an input port of the
threshing device. Some
cereal grain which is not plump and moves along with
airflow can be secondarily cleaned, and the
cereal grain is prevented from being discharged as impurities. Accuracy of
impurity removal is improved, and the cleaning effect is improved.