The invention relates to grain machinery, in particular to a combined cleaning sieve used for grain deep-processing enterprises and multistep sorting before grain warehousing. The combined cleaning device is composed of a sieve box, a grain cleaner and a chain-type brush plate mechanism, the grain cleaner is arranged on the upper portion of the sieve box, the chain-type brush plate mechanism is composed of a driving shaft, a driven shaft, a chain, a brush rod, a brush rod rail and a brush plate combined member and driven independently by a motor, the brush rod is fixed on two chains and driven by the same to be in circulating motion, and in order to prevent vibration of the brush rod during running, two ends of the brush rod are limited in the rail during running. The combined cleaning device has the advantages that the combined cleaning device is compact in structure, high in sorting efficiency, high in yield, stable and reliable in running, low in noise and little in environment pollution and is energy-saving emission-reducing efficient grain sorting equipment.