Dietary precautions after anal fistula surgery are as follows: 1, pay attention to drink more water, daily water intake of at least 2,000 ml or more; 2, more intake of dietary fiber-rich foods, dietary fiber content to be ingested every day more than 25g, in order to soften the stool, reduce the incision of the stimulus; 3, the food should be diversified, nutrition should be balanced, appropriate intake of protein-rich foods, such as fresh fish, meat, milk, eggs, etc., avoid spicy, cold and other stimulating foods; 4, fiber-rich foods are commonly found in fresh vegetables, fruits, beans and mushrooms. Eggs, etc., to avoid spicy, cold and other stimulating foods; 4, fiber content of food commonly found in fresh vegetables, fruits, beans and mushrooms. Research has found that the fiber content of mushrooms is the highest content in the daily diet, every 100g of mushrooms often contain more than 7g of fiber. So a normal diet can be supplemented with more mushrooms, followed by legumes as well as coarse grains. Dietary fiber in the intestinal tract can absorb water, so that the stool becomes fluffy, soft and easy to discharge.