Duck can be eaten after rectal cancer surgery, but it should be eaten in moderation. Rectal cancer is a malignant tumor and belongs to consumptive disease, so it needs to replenish nutrition and energy through diet, ensure the intake of protein, vitamins and so on, and enhance the immunity of the body, so that the body can resist the malignant tumor better. Duck contains protein, vitamins and niacin and other nutrients, which are beneficial to the human body, especially tumor patients. However, duck is not recommended to be eaten more after rectal cancer surgery because duck meat is not easy to be digested. Post-operation rectal cancer patients’ intestinal function is affected, diet should be light, if not pay attention to diet easy to occur intestinal adhesion and so on; in addition, the healing time of post-operation wounds is long, frequent defecation may occur anastomotic fistula and so on. Therefore, duck meat should be eaten less. After rectal cancer surgery, one should start with fluids, gradually return to normal diet, drink more water, avoid spicy and stimulating food, and have a balanced diet, not partiality, to avoid malnutrition.