The increase of dietary fat energy supply ratio has led to a gradual increase in obesity, and the risk of hypertension in patients with obesity is much higher than that in the normal population. Weight loss has become a popular method to control obesity and hypertension. Metabolic bariatric surgery (MBS), which is also called weight loss surgery, can have significant effects on the weight and body metabolism of the patients. Recent studies have shown that the blood pressure of obese patients with hypertension is significantly improved after MBS. Therefore, in this review we will briefly describe the relationship between obesity and hypertension, summarize the effects of MBS on hypertension, and then focus on the mechanisms by which MBS achieves satisfactory efficacy to treat hypertension.