Large cylindrical cleaning sieve

The utility model provides a large-scale cylinder cleaning sieve which comprises a support, a box body installed on the support and a cylinder sieve installed in the box body in a rotating mode, a feeding hopper is arranged on one side of the box body so that grain can be guided into the cylinder sieve, the cylinder sieve is installed on the two sides of the box body in an inclined mode, and a rotating shaft is installed in the middle of the cylinder sieve. Grain is guided into the drum screen from the feeding hopper, the drum screen is obliquely arranged, when the drum screen rotates, the grain moves downwards through the gravity of the grain, the drum screen is divided into a plurality of screening areas through the partition plates, and the grain is screened step by step by means of the fact that the apertures of screening plates installed in the screening areas are different. Dust and small-particle impurities are firstly guided out through the first discharging hopper and the second discharging hopper, t