The invention discloses a grain cleaning machine. The machine comprises a feeding channel, one end of the feeding channel is provided with a feeding port, the other end of the feeding channel is provided with a discharging port, and the feeding channel is obliquely arranged downwards from the feeding port to the discharging port; the machine further comprises a pair of feeding rods, wherein the feeding rods are arranged in the feeding channel in parallel, and the feeding rods are arranged in the feeding channel in a manner that the feeding rods can move back and forth relative to the feeding channel; each feeding rod comprise a strip-shaped plate body and a plurality of fins arranged on the strip-shaped plate body, and the fins are made of soft plastic sheets; the length of the fins is greater than one half of the distance between the pair of strip-shaped plate bodies; the machine comprises a pair of feeding power mechanisms, the feeding power mechanisms are used for driving the pair of feeding rods to move in opposite directions; the machine comprises a dust removal air flue, one end of the dust removal air flue is connected with one end of the feeding channel, and the inclinationdirections of the dust removal air flue and the feeding channel are opposite to each other; and the machine comprises a draught fan, and the draught fan is arranged at the other end of the dust removal air flue. According to the grain cleaning machine, efficient dust removal of the grains is realized, and the cleanliness of the grains is improved.