The efficacy of conventional chemotherapy is hindered by cancer cells' escape from the immune system. Herein, we report a multifunctional nanohybrid system for effective immuno-chemotherapy against cervical cancer. This nanohybrid contains both immune checkpoint inhibitor and cisplatin anticancer prodrug, showing improved cellular accumulation and increased binding of Pt to DNA and resulting in elevated apoptosis than using cisplatin alone when tested in cervical cancer cells. Intriguingly, the use of immune checkpoint inhibitors enables the inhibition of indoleamine-2,3-dioxygenase and reverses immunosuppressive T cells to recognize cancer cells, leading to T cell proliferation and activation, cancer cell cycle arrest, and ultimately increased cancer cell death. Overall, we provide a novel strategy using a multifunctional nanohybrid system to boost the antitumor activity of cisplatin, the gold standard chemotherapeutic treatment for cervical cancer.