The present invention relates to a seed planting method, in particular, it relates to a composite capsule seed seedling-cultivating planting method. Said method includes the following several steps: a, defining seed variety to be filled into capsule, checking and verifying nutrient characteristics of said seed variety, defining object yield and growth stage, getting soil type of planting land, water content condition and disease and pests data related to said variety; b, designing formula of development powder, according to the step a defining mixing ratio of 14 nutrient elements, selecting variety of bactericides, fungicide and pesticide, selecting variety of slow-release fertilizer, calculating weight of above-mentioned every raw material and calculating filling amount of development powder; C, according to the step b, designing internal volume of capsule, according to the step a defining form of seed variety capsule; and d, according to the step c making capsule and making planting.