The utility model relates to efficient conveying and cleaning equipment of a combine harvester. The efficient conveying and cleaning equipment of the combine harvester comprises a threshing and separating device, a conveying device and a cleaning device. The conveying device is composed of a driving shaft, a driven shaft, gears, a chain, chain harrows and a conveying bottom plate, the driving shaft is in power connection with a power system of the harvester, the gears are symmetrically distributed at the two ends of the driving shaft and the two ends of the driven shaft, the chain is located on the gears, and the chain harrows are uniformly fixed to the chain. The cleaning device comprises a draught fan and a sieve box, the sieve box is composed of a front sieve, a middle sieve and a tail sieve, one end of the front sieve abuts against the conveying bottom plate, and the other end of the front sieve is connected with the middle sieve and the tail sieve in sequence. The efficient conveying and cleaning equipment of the combine harvester is simple in structure, reasonable in design, capable of effectively solving the problem of grain running on a slope and a steep road, high in conveying efficiency and cleaning efficiency, short in period, low in manufacturing cost and convenient to popularize.