Flowers have a high medicinal value and contain secondary metabolites including flavonoids, volatile oils, organic acids, terpenoids and alkaloids as well as polysaccharides as important active compounds with many functions including antioxidant, anti-inflammatory, hypoglycemic, hypolipic, anti-tumor, and immunoenhancing properties. In this article, the progress in the chemical composition and biological activity of polysaccharides in flowers in the past five years is summarized, and future research directions and application prospects are discussed. Through this review, we hope to provide an impetus for further research on flower-derived polysaccharides and provide reference for the development and utilization of related health products.