Tumor immunotherapy is a therapeutic strategy involving reinitiating and maintaining tumor immune cycle and restoring the body's normal anti-tumor immune responses so as to inhibit tumor growth and eliminate tumor cells. Examples of such products include monoclonal antibody immune checkpoint blockades, therapeutic antibodies, cancer vaccines, cell therapies, and small molecule inhibitors. In the last few years, numerous achievements in the field of tumor immunotherapy. Many immunotherapeutic products have exhibited potent anti-tumor activity in the treatment of several solid tumors such as melanoma, non-small cell lung cancer, kidney cancer and prostate cancer and have been granted approvals for clinical use by FDA. Tumor immunotherapy was awarded as the most important scientific breakthrough by Science in 2013 for its excellent efficacy and innovation.