Immunotherapy is a method of using immune agents to artificially enhance the immune function of the organism so as to treat the disease. Immunotherapy is a therapeutic method to improve the immunogenicity of tumor antigens with the help of existing immunological theories and technologies, use immune agents to stimulate and enhance the body’s anti-tumor immune response, induce tumor-specific cells and molecules in vivo and externally, and ultimately achieve the elimination of tumors. At present, immunotherapy is generally used as an adjuvant therapy to surgery, chemotherapy and radiotherapy for patients with ovarian cancer, breast cancer, lung cancer, colon cancer, pancreatic cancer, leukemia and so on, and it can be used for integrated treatment with radiotherapy or chemotherapy. It is recommended that patients with related diseases should seek medical treatment in time and choose the most suitable treatment method with the help of doctors.