Rectal cancer is a common digestive tract tumor disease, which occurs in human digestive tract. After surgical treatment, patients need observation and care, especially postoperative care, which is conducive to full recovery. In the diet of rectal cancer, it is recommended not to overeat, which will only aggravate the deterioration of the disease and affect the burden on the intestine and heart. Soybean milk is rich in nutrients, including plant protein, phospholipids, vitamin B 1, B2, nicotinic acid, iron, calcium and other minerals, especially iron, which is richer than any other milk. Every100g of soybean milk contains protein 4.5g, fat1.8g, carbohydrate1.5g, phosphorus 4.5g, iron 2.5g, calcium 2.5g, vitamins and riboflavin. It is of great benefit to enhance physical fitness. Therefore, patients with rectal cancer can of course drink soy milk. Soymilk is easy to digest and absorb. For patients with rectal cancer, moderate drinking is beneficial to supplement some nutritional needs of the body, and at the same time, it can improve the disease resistance of patients and prevent cardiovascular diseases. It can be said that it is a good drink for cancer patients to keep healthy. Especially for gastric cancer, intestinal cancer and breast cancer. Although soybean milk is good, it is not suitable for everyone. Chinese medicine says that soybean milk is cold and slippery, which is cold to the stomach and contains a certain amount of oligosaccharides. If consumed in large quantities, it may lead to nausea, belching, acid swallowing, abdominal distension, diarrhea and other symptoms. Cancer patients with spleen and stomach weakness and abdominal distension should pay attention to avoid aggravating discomfort symptoms, so patients with rectal cancer should drink soy milk selectively. Patients with rectal cancer should pay attention to avoid drinking uncooked soybean milk, drink it on an empty stomach, don't be compatible with brown sugar, and don't drink a lot. It is not suitable to drink with drugs. Drinking soybean milk also has a lot of knowledge. Patients with rectal cancer should also pay attention to the way, quantity and food used in drinking soybean milk, which is very helpful to play the positive and beneficial side of soybean milk. The above is the introduction of soybean milk for rectal cancer patients after operation. The diet of rectal cancer plays a very important role in the postoperative recovery of patients. I hope that the patients' friends and family members will pay attention to it.