The invention provides a cereal spreading and airing device of a drying yard. The cereal spreading and airing device comprises a rack formed by welding a funnel supporting frame and a splitter plate supporting frame, wherein a feeding funnel is arranged at the upper end of the funnel supporting frame; a splitter plate is mounted on the splitter plate supporting frame; the upper end of the splitter plate is of a square groove structure and the lower end of the splitter plate is of a trapezoid groove structure with a small top and a large bottom; the square groove structure at the upper end of the splitter plate is located just under an outlet of the feeding funnel; a plurality of rows of splitter stopping blocks are uniformly arranged on the surface of the trapezoid groove structure of the splitter plate; and the quantity of the splitter stopping blocks of each row are increased in sequence from top to bottom. The cereal spreading and airing device of the drying yard is novel in design, and simple and reliable in structure; and the time for spreading cereals when the cereal are dried can be saved, the labor time is saved and the labor intensity is alleviated.