Obesity is now a global epidemic, and increasingly younger, while obesity can also cause a variety of concomitant diseases, a serious threat to people’s health and safety. And the body and mind are inseparable parts, obesity in the impact of physical health at the same time, but also prone to cause a variety of psychological disorders. Such as depression, anxiety, bulimia, etc. may be caused by obesity. So can weight loss surgery, which is highly effective in treating severe obesity and its accompanying disorders, also treat these psychological disorders at the same time? Obesity and the mental illnesses it causes can affect each other in some ways. As it is difficult to obtain long-term stable weight loss results with traditional weight loss methods, it is easy to hit the patient’s self-confidence, which makes the patient more prone to psychological disorders, thus giving up weight loss or relieving the psychological pressure by binge eating, etc., which makes obesity more serious. He also pointed out that addressing psychological barriers is also one of the important steps before carrying out weight loss surgery. Weight loss surgery is a systematic project, in addition to surgery later also need patients to cooperate with the treatment in order to maintain the effect of the surgery, so it is necessary to carry out preoperative education and psychological counseling, so that patients can accept and cooperate with the changes brought about by the surgery. In addition, the surgery itself can also play a certain role in psychological relief. As in the period of becoming obese, when patients see that their weight is decreasing after undergoing weight loss surgery, their self-confidence will continue to grow and their psychological barriers will be treated or improved. The anxiety and mood disorders previously caused by obesity will also be eliminated with the reduction of weight. Psychological problems are mainly caused by the patient’s own situation and external factors, and the psychological disorders caused by obesity will be improved after weight loss surgery. If better results are needed or if other psychological disorders are to be prevented, the intervention of a psychiatrist is required to provide psychological counseling and advice to the patient.