Immunotherapy for tumors is currently clinically effective. The principle of immunotherapy is to help cancer treatment by activating the patient’s own immune system to fight against cancer cells and tumor tissues to kill some or all cancer cells. With the continuous development of medicine, the application of immunotherapy in cancer treatment has become more and more widespread, such as the use of BCG infusion to treat superficial bladder cancer. Although the use of immunotherapy is still not a complete cure for cancer, it can effectively prolong the survival of cancer patients. Currently, immune agents commonly used in clinical treatment of cancer include immune checkpoint inhibitors (PD-1 inhibitors, CTLA-4 inhibitors, etc.), cancer vaccines, and CART therapy, which are applied to melanoma, head and neck cancer, non-small cell lung cancer, and other cancers, and have achieved better efficacy. Of course, patients with different body types may also experience certain side effects from immunotherapy, such as skin rash, hypothyroidism, etc. Immunotherapy is currently a relatively new treatment in tumor therapy, and there are still uncharted territories waiting to be explored.