The treatment of rectal mucinous adenocarcinoma needs to be analyzed specifically according to the patient’s physical condition and the extent of the disease, and treated symptomatically. The treatment modes include surgery, chemotherapy, radiotherapy and so on. Rectal mucinous adenocarcinoma belongs to one kind of adenocarcinoma, which is a kind of malignant epithelial tissue tumor. It occurs in the rectal area, and it is called rectal mucinous adenocarcinoma when there is a lot of mucus in the lumen of the gland and around the gland. After diagnosed with rectal mucinous adenocarcinoma through examination, if the patient is in early stage, open surgical resection can be performed to prevent the cancer cells from spreading and metastasizing. If it is in middle or late stage, patients can be treated with chemotherapy or radiotherapy under doctor’s guidance on the basis of surgical treatment to inhibit tumor growth and shrink the tumor. It is suggested that patients with rectal mucinous adenocarcinoma should seek medical examination in time and cooperate with doctor’s treatment plan to avoid delaying the disease.