A method for promoting the germination of ryegrass multiflora seeds and the growth of seedlings is to sow ryegrass multiflora seeds directly in a nutrient bowl equipped with a substrate, sow 1 to 3 seeds per nutrient bowl, and cover the upper layer with a substrate of 1.5 to 2.0 cm. Press lightly, place the nutrient pot on the seedbed, add water to the seedbed to 1~1.2cm from the bottom of the nutrient pot, the water will completely infiltrate the substrate, before emergence, add water at any time so that the moisture content of the substrate is 35~40%, after germination, spray indium Indoleacetic acid IAA solution. The invention can make the germination rate of ryegrass multiflora seeds high, which can be as high as 93%, the germination index is high, which can be as high as 53, the vitality index is high, which can be as high as 448 or more, the growth of seedlings is good, the whole plant of seedlings can reach more than 11cm, and the seedlings can The length is more than 8.4cm, the root length can be more than 2.5cm, the fresh weight of the whole plant can reach more than 4g, the fresh weight of the seedling can reach more than 1.48g, and the fresh weight of the root can reach more than 2.4g. The cycle is short, the method of the invention is simple and reliable, and is worthy of market promotion and application.