The invention mainly relates to the technical field of planting, and discloses a method for prolonging the Chinese-redbud flowering period. The method includes the steps of topdressing in winter, before-flowering clipping, nutrition spraying and illumination adjusting. The method is simple, operation is convenient, the flowering period of Chinese redbud is kept for 23 days to 25 days, flowers of young and tender branches are flowered by 8 days to 9 days in advance compared with leaves, the flowers extend to the tops of the branches, and are dense and beautiful in color, and the ornamental value of the Chinese redbud is improved; in winter, organic fertilizer is additionally applied to roots of the Chinese redbud, the soil structure is improved, the content of organic matter and the content of oxygen of soil are increased, absorption and storage of nutritional ingredients of the Chinese redbud are promoted, and nutrition preparation is provided for flowering and branches in next spring; in February mid of spring, the Chinese redbud is clipped, old branches are removed, and new branch germination is promoted; meanwhile, nutrients are fully supplied to growth and flowering of the tender branches, the tender branches are girdled, nutrition storage is increased, flower bud growth is promoted, the flower color is bright, the quantity of the Chinese-redbud flowers is increased, and the quality of the Chinese-redbud flowers is improved.