The treatment of mucinous lung adenocarcinoma is related to the stage of the disease, in which early and intermediate stage patients can be treated with surgery, while most of the advanced stage patients need to be treated with a combination of radiochemotherapy, targeted drugs and immune drugs. Mucinous lung adenocarcinoma is a special type of lung adenocarcinoma characterized by abundant mucus in the tumor with unique clinicopathological features and immunophenotype. This disease is highly malignant and has a relatively poor therapeutic effect. If the mucinous lung adenocarcinoma is in early or intermediate stage, and there is no metastasis or spread of cancer cells for the time being, it can be resected by radical surgery. After surgery, adjuvant radiotherapy and chemotherapy can be chosen according to the condition. If the disease has progressed to the advanced stage and lymph node metastasis or distant metastasis has occurred, radiotherapy, targeted drugs or immunotherapy can be used to control the development of the disease, so as to prolong the life span. During treatment, patients should pay attention to diet, quit smoking and drinking, eat less spicy and stimulating food, and eat more vegetables and fruits. At the same time, actively cooperate with the doctor to avoid delays in treatment.