Abstract: In order to investigate the purification process and in vitro hypoglycemic activity of mung bean skin polyphenols (MBPs), this study extracted MBPs using ultrasonic-assisted extraction method. The adsorption and desorption capabilities of eight different types of macroporous adsorption resins for MBPs were studied to select the best resin type. The purification process was optimized using single factor experiments, and the chemical composition of the purified MBPs was identified by UPLC-ESI-QTOF-MS/MS. Meanwhile, the inhibitory activities and types of MBPs on α-amylase and α-glucosidase were investigated with acarbose as the positive control. The results showed that HPD-500 resin had the best adsorption-desorption effect for MBPs. The optimized parameters of purification process were polyphenol concentration of 0.25 mg/mL, pH of 6, ethanol concentration of 80%, loading flow rate of 1 BV/h, and elution flow rate of 2 BV/h. The purity of purified MBPs was 57.23%, which was 2.55 times higher than that of the crude extract. Twelve phenolic compounds, including gallic acid, kaempferol, vitexin, isovitexin, and apigenin, were identified in the purified MBPs. The results of in vitro hypoglycemic activity study showed that MBPs had good inhibitory activities on α-amylase and α-glucosidase, with IC₅₀ values of 98.85 μg/mL and 7.25 μg/mL, respectively, and the inhibition of MBPs against both enzymes was mixed-type inhibition. In summary, purified MBPs had good in vitro hypoglycemic activity and could be developed and utilized as functional ingredients in health foods.