A direct measurement of Gallic acid at the silver electrode modified with the help of anion exchange membrane (TDMAC) under different condition of cyclic voltammetery. The measured value of Gallic acid in the different samples of wine estimated the antioxidant property of wines, which depends on the oxidation process of Gallic acid. The presented modified method based on oxidation, which occurred on the working Ag electrode fabricated by anion exchange membrane. The modified sensor gives a linear response of potential with the Gallic acid concentration in the range from 0.05 to 3.0 g/L with best detection limit of 6.6 mg/L This sensor also gives a quick response time, satisfactory reproducibility, best sensitivity and long lasting stability, and measure the antioxidant capacity of the samples of wine without any interfering of ascorbic acid, metal ions and glucose. The results found by this modified electrode were correlated with the standard Folin- Ciocalteu method.