The invention discloses a method for cultivating the seed resource of Japanese premna, which comprises the following steps of: step 1, nursery selecting, select sandy loam soil with deep layer and loose structure as nursery; step 2, collect panicles, select a semi-lignified branch which is not affected by the disease and is brown and gray; step 3, land preparation and ploughing, dig a drainage ditch, crumble the soil, rake the soil level, and obtain a seedbed, plowing need to be carried out for two times; step 4, shading and cutting, cut the panicle, shade the premna microphylla seedling by using a shading device; adjust the shading intensity as needed; step 5, managing the seedbed, spray water on the seedbed to keep the bed wet, apply the liquid fertilizer from weak to strong , remove weeds and buds from the seedbed; step 6, harvesting, after the premna microphylla is grown, harvest the stem and leaf of the premna microphylla to obtain the Japanese premna. The method for cultivating seed resource of Japanese premna mainly solves the problem that the quantity of natural premna microphylla is currently not meeting the market demand.