Grade II squamous cell carcinoma of the lung is of medium severity in terms of differentiation, but it depends on clinical staging. Lung squamous cell carcinoma grade II is based on the cell differentiation level, which indicates that its differentiation is medium, and its malignant degree, invasiveness and metastatic rate are also at medium level, which is better than low differentiation but more serious than high differentiation, and the specific severity needs to depend on the clinical staging situation. Early squamous cell carcinoma only exists in the mucous membrane layer, and can be cured only after radical surgery, and the situation is not serious; once it enters into the middle and late stages, and the cancer cells have metastasized to lymphatic and distal organs, it will be more difficult to be cured, and the situation is relatively more serious.