The invention relates to the agricultural field, which is a method for improving output and quality of lucern seeds, and comprises selecting and preprocessing land blocks, selecting grass seeds and breaking dormancy of lucern seeds, producing nodule bacteria into bacteria liquid, spraying the bacteria liquid to seeds in the dark, low-temperature and humid environment, and fully and evenly churning the nodule bacteria with the seeds, and planting and sowing, the occupied area of each seedling is 0.24-0.35m 2, adopting mild irrigating and fertilizing weedicide to weed, penetratingly irrigating for a time in the early stage of budding and flowering, and further watering in flowering and pod-bearing period, auxiliary pollinating by human labor and preventing and curing pests, when 2 / 3-3 / 4 of green pods of lucerns become brown and seeds become yellow, the seeds of lucerns are mature, and people can reap, and thinning out of branches and planting after seeds are reaped. The invention overcomes the shortcomings in the prior art and controls line space and planting distance to continuously achieve the highest seed output in many years.