The vast diversity of secondary metabolic compounds in plants arises from the myriad of molecular modifications they undergo. One such modification that is vital for plant growth and development is glycosylation. Glycosyltransferase (GT), as the enzyme central to catalyzing the synthesis of glycosylation products, includes the UGT family, which primarily utilizes Uridine diphosphate (UDP) as the glycosyl donor. Plant glycosylation reactions play a pivotal role in regulating the solubility, stability and bioactivity of various plant metabolisms. They are closely associated with plant quality traits and responses to abiotic and biotic stresses. Glycosyltransferases, the key enzymes that facilitate glycosylation product biosynthesis, have garnered significate attention in recent years as a trending topic. In this paper, we review the structural and catalytic features, reaction types, functional classifications of glycosyltransferases in ornamental plants. Additionally, we also summarize current research progress on modifying hormones, terpenoids, and flavonoids in ornamental plants using UDP-glycosyltransferases. This modification affects. flower color, leaf color, leaf shape, and plant adversity as well as functional compound composition. This summary can serve as a reference for further investigation into the metabolic regulation of ornamental plants. It also provides a theoretical foundation for enhancing the floral quality of ornamental plants, strengthening their ability to cope with stress . Additionally, it will aid in the cultivation of new plant varieties with special functions and the development of functional plant-based compounds from the same source of food and medicine.