The invention relates to the technical field of lawn planting maintenance, and discloses a lawn cover-sowing method based on south-north transition zones of China, which comprises the steps of a, a, treating warm season lawns before cover-sowing, to be specific, a1, carrying out warm season lawn pruning, a2, carrying out lawn ventilation, a3, carrying out lawn weeding and disinfestation, and a4, carrying out fertilization and watering; b, sowing cold season grass seeds, to be specific, b1, sowing the seeds, and b2, covering with soil; c, providing seedling stage maintenance, to be specific, c1, watering, and c2, trimming. Also included is a maintenance method of a cold season lawn and a warm season lawn in succession stage from the beginning of May to the end of July; the maintenance method for the succession stage comprises the steps of pruning the lawns in May; irrigating once a week if there is no raining, irrigating each time being stopped until 5-10 cm of soil is saturated. The cover-sowing method disclosed by the invention helps keep the lawns in the south-north transition zones of China evergreen in four seasons, the lawns are good in color, texture, uniformity and density improvement, and the ornamental performance of the lawns is obviously improved.