Studied the antioxidant and anti-obesity effects of obesity induced SD-Rats by high fat diet of purple sweet potato extract. Antioxidant activity of purple sweet potato extract measurement results, showed a concentration-dependent manner in general. 1 mg/ml in the extract concentration showed the highest activity with 1,810 ppm poly phenol content, DPPH radical scavening activity of 30% and standards BHT 50 ug/ml and showed a similar activity in comparison. Superoxide dismutase (SOD) and reducing power is increased antioxidant activity in a concentration-dependent. This purple sweet potato extract that oral administration of 8 weeks in a way that leads to obesity in the high-fat diet SD-Rats reduced body weight, total cholesterol and triglyceride was also reduced. Therefore, we expect to leverage the potential of a possible natural antioxidant and anti-obesity purple sweet potato extract.