Many people think that high blood lipids and coronary heart disease are an adult matter and have little to do with children, but there is growing evidence that high blood lipids can be present in childhood and can also exacerbate coronary heart disease. So what is the cause of high triglycerides in children? The cause of high triglycerides in children is mainly due to unhealthy lifestyle. As children today eat too much refined white rice and flour and too little coarse grains, they lack soluble dietary fiber (mainly found in barley, oats, beans and fruits) in their bodies, and they like to eat high-fat, high-calorie and high-protein foods, love fast food, sweets, snacks and fried foods, and do not like vegetables and fruits. When high-fat, high-calorie foreign fast food, soft drinks, sweets and cold drinks become an important part of children’s food, the excess calories consumed by children are stored in the body in the form of triglycerides leading to obesity. The lack of micronutrients and vitamins due to poor diet structure causes abnormal lipid metabolism. The treatment of high triglycerides in children should begin with a special emphasis on dietary therapy, which is the best option for high triglycerides in children. Diet therapy emphasizes the diversity of food, comprehensive, balanced and high quality food is necessary for normal growth and development of children, avoiding insufficient energy intake or over intake and maintaining normal weight. Also quitting smoking and alcohol, moderate exercise and psychological balance and emotional optimism are conducive to normal blood lipid metabolism.