In recent years, immunotherapy has made breakthroughs in the field of malignant tumors, and more and more novel immune checkpoint inhibitors have been developed, revolutionizing the first-line, second-line and post-line treatment options for malignant tumors. Tislelizumab is a domestically developed inhibitor of programmed death-1 (PD-1). The drug has shown good antitumor potential and safety in classical Hodgkin's lymphoma, uroepithelial carcinoma, non-small cell lung cancer, hepatocellular carcinoma, esophageal squamous cell carcinoma and gastric cancer/gastroesophageal junction carcinoma. In this review, the structure and mechanism of action, pharmacodynamics and pharmacokinetics, clinical research and adverse reactions of tislelizumab are reviewed to provide reference for clinical application.