Diet after rectal cancer fistula surgery should be light, soft and easy to digest, and it is suggested that patients should eat less and more frequent meals during the recovery process to avoid other adverse reactions. Diet of patients after rectal cancer fistula surgery should be light, soft and easy to digest. In the early stage, they can eat some fluids, such as rice porridge, rice soup, milk, meat soup, fish soup, etc. When the condition recovers and stabilizes, they can eat some more dietary fiber. In the later stage when the condition is recovered and stabilized, you can eat some food with high dietary fiber, such as yam, corn, spinach, celery, etc., which can promote gastrointestinal peristalsis and help the patient’s bowel movement. It is recommended that the patient replenish water in time during the recovery process, pay attention to keep warm, avoid getting cold, and do not eat spicy, cold, greasy food, so as not to affect the recovery.