Cadonilimab (AK104), China's first globally developed bispecific antibody targeting both PD-1 and CTLA-4, has demonstrated manageable safety and promising anti-tumor activity in female cervical cancer, esophageal squamous cell carcinoma, and hepatocellular carcinoma. However, there is currently no available data on the efficacy and safety of cadonilimab combined with monotherapy chemotherapy for treating advanced non-small cell lung cancer (NSCLC) with negative driver genes and previous immunotherapy failure. Therefore, this study aims to prospectively and openly evaluate the efficacy and safety of cadonilimab combined with monotherapy chemotherapy in treating patients with advanced NSCLC with negative driver genes and previous immunotherapy failure using a single-arm trial design. The goal is to provide a more effective and safe treatment option for these patients.