The invention provides a planting method for improving the radix cynanchi bungei flavonoid content. The method comprises the following steps of S1, sterilization and seed soaking; S2, seedling culture; S3, field planting; S4, organic fertilizer application after the field planting: after the field planting is performed for 2 to 3 months, performing drip irrigation on the roots of plants by brine;performing drip irrigation once every week, wherein the concentration of the brine is 3.75 to 15 g/L. By using the technical scheme, after the field planting of radix cynanchi bungei, the brine with the proper concentration is used for performing drip irrigation on the roots of the radix cynanchi bungei; the low-concentration salt stress stimulation effect is used; the radix cynanchi bungei flavonoid content is effectively increased, so that the radix cynanchi bungei has higher medical values.