The invention belongs to the technical field of forage grass planting, and particularly relates to a method for planting forage grass in coastal saline-alkali sloping fields of the Yellow River Delta. Utilizing micro-terrain building mode, piling raw soil to form piling area, forming low-lying water collecting area around the piling area; The piling area is located in the coastal saline-alkali soil area and is elevated by piling raw soil with the ground level as the reference, and irrigation pipelines are horizontally arranged around the middle point of the slope of the piling area for one circle; The slope surface is a forage grass planting area, cow dung is applied to the slope surface and soil is loosened, and then grooves are dug to plant forage grass according to the salinity content of the slope surface; The low-lying water collecting area is positioned around the stacking area, the original soil forming the stacking area is lifted and dug to form a ditch, the depth of the ditch is 2 to 3 meters, and the low-lying water collecting area stores fresh water in rainy seasons or brackish water after salt pressing irrigation in planting areas around coastal saline-alkali soil areas. The method comprises the following steps of : carrying out micro-terrain reconstruction on the relatively simplified alluvial plain of the landform of the Yellow River Delta region to construct a stacking region; and planting salt-tolerant forage grass by adopting a corresponding cultivation technology according to different salinity of the slope surface of the stacking region.
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