The invention, which belongs to the technical field of soil improvement, discloses an improved method of deep digging of degenerated grazing leymus chinensis grassland at a grassland area. According to the improved method, one group of three-furrow ploughs and heavy harrows are dragged by a tractor to carry out smoothing improvement on manual soil loosening and clod crushing on the degenerated grazing leymus chinensis grassland. The improved method comprises: step 1, a tractor with the power larger than or equal to 80 horsepower drags one group of three-furrow ploughs to carry out soil loosening on the degenerated grazing leymus chinensis grassland at a rainy season at the first year, wherein the effective tillage depth is 18+/-2cm; and step 2, reciprocating harrowing is carried out twice by using heavy harrows at the direction parallel to the tillage direction before the rainy season at the second year, wherein the effective depth is 12+/-2cm. With the method, the soil can be loosened effectively; the soil porosity is increased and the soil bulk density is reduced. Meanwhile, the rootstocks of the chinese wildrye can be cut off to promote the sprout differentiation and growth, thereby accelerating the recovery and growth of the chinese wildrye.