Method of multi-year seedling producing and collecting by one-time planting of sweet potato nursery

The invention provides a method of multi-year seedling producing and collecting by one-time planting of a sweet potato nursery. The method comprises the steps of planting in the nursery, building a greenhouse and circularly managing the sweet potato nursery at a plurality of times; the step of circularly managing the sweet potato nursery at a plurality of times involves the greenhouse period, the seedling collecting and planting period, and continuous growing and utilizing period of the seedlings. According to the method, the growth utilization period of the sweet potato seedlings in the nursery is prolonged, rather than removing the bed seedlings, according to germination habits of the sweet potato when the sweet potato seedlings cultivated in the nursery of various types meet the requirement on planting in spring and summer of the current year, then the seedlings can continuously grow in the bed, and the management is improved to continuously cultivate strong seedlings; the seedlings are cultivated and collected and planted in a large land or used for other proposes year after year; therefore, a novel way for collecting the sweet potato seedlings by one-time planting is created.