Surgical resection of the original focus of sigmoid colon cancer, or radical sigmoid colon cancer surgery, removes the sigmoid colon tumor and anastomoses the severed ends together. Sigmoid colon cancer is a type of colon cancer, and its main treatment is radical sigmoid colon cancer surgery. In the lower abdomen, an incision is made in the middle of the abdomen to free the sigmoid colon from the cancerous part and the diseased blood vessels and lymph, and then the diseased part is resected, and the broken end can be anastomosed if the blood flow is good, or fistulas can be made if it is difficult to be sutured, and the anastomosis can be made again after it is stabilized. Contraindications for radical sigmoid colon cancer surgery are extensive infiltration of sigmoid colon cancer, unresectable adhesion between cancer and surrounding tissues and organs, intestinal obstruction, etc. During the surgery, attention should be paid to protecting nerves and blood vessels. During surgery, attention should be paid to protecting nerves, blood vessels and so on, thus preventing abnormalities in urination and defecation. Patients should undergo radical surgery for sigmoid colon cancer under the guidance of specialized doctors.