The expected goal of the treatment of nutritional disorders in patients with sigmoid colon cancer is that the patient does not lose weight during hospitalization. The development of nutritional disorders is related to the high metabolism of malignant tumors as well as to changes in dietary habits, which require standardized postoperative care. Patients with nutritional disorders of sigmoid colon cancer need to be given easy-to-digest high-quality protein nasal fluid diet. Cancer patients have high protein catabolism and weakened synthesis ability in their bodies, so they need to be supplemented with more exogenous high-quality protein. Such as beef, fish, eggs and so on. In addition to protein, adequate vitamins and fibers are needed, try to avoid spicy food with high fat, eat vegetables and fruits appropriately, check the patients regularly and weigh them regularly to grasp the trend of weight change of the patients. Patients with sigmoid colon cancer need standardized nursing care, and patients also need to actively cooperate with doctor’s treatment, follow doctor’s instruction and standardized treatment under doctor’s guidance.