This paper investigates in detail the variety of phytochemicals found in different leaves that have been shown to have anti-diabetic properties. The ongoing worldwide health crisis of diabetes mellitus has prompted researchers to look for efficient treatment solutions, especially those derived from natural sources. Many plant species' leaves have been studied for their bioactive components that may influence how glucose is metabolised and lessen the symptoms of diabetes. The phytochemicals found in these leaves, including as flavonoids, alkaloids, terpenoids, and phenolic compounds, are the subject of contemporary study, which is summarised in this article. Furthermore, the processes that underlie their anti-diabetic activities are clarified, providing insight into their potential as therapeutic agents in the future. Our goal is to contribute to the development of new diabetes therapies by offering insightful information on the wide range of bioactive components present in leaves that have anti-diabetic qualities.