Abstract : In an attempt to better understand the role of medicinal plants in the treatment of diabetes, an ethnobotanical survey was conducted in the city of Sidi Bel Abbes among dozens of diabetic patients. The results obtained by 90 patients allowed us to identify 20 medicinal plants and 11 ethnobotanical family, based on the statistical analyses which were conducted using RStudio software a phytochemical study was achieved on the most cited plants representing, Olea europaea L cited by 20 individual (22.22 %) Rosmarinus Officinalis cited by 12 individual (13, 33%) and Artemisia herba Alba Asso cited by 6 individuals (6.66%). The results of qualitative phytochemical analysis revealed the presence of such active substances as flavonoids, tannins, alkaloids and phenols, almost no side effects were associated with the use of medicinal plants and concluded that these plants can be a natural source of antioxidant compounds of high importance.