The utility model relates to a thin-layer grain drier belonging to agricultural machines, which is mounted between two adjacent horn-shaped pipes with equal cross section in a drying tower. The horizontal interval is 320mm, and the vertical interval is 250mm, and two segments of burning self-controlled oil burners are mounted on the end portion on one side of a hot-air furnace. The thin-layer grain drier achieves the drying operation of grains on a thin layer whose thickness is less than 300mm in the drying tower and automatic switching of two-segment or one-segment burning of a burner in the hot-air furnace. The thin-layer grain drier is suitable for and satisfies the drying technique requirements of different grains, which has the advantages of big drying intensity, even drying, excellent drying quality, high production efficiency, energy source saving and wide application scope.