Immunotherapy has brought a new dawn for human being to defeat cancer. Although existing immunotherapy regimens (CAR‐T, etc.) have made breakthroughs in the treatments of hematological cancer and few solid tumors such as melanoma, the therapeutic efficacy on most solid tumors is still far from being satisfactory. In recent years, the researches on tumor immunotherapy based on nanocatalytic materials are under rapid development, and significant progresses have been made. Nanocatalytic medicine has been demonstrated to be capable of overcoming the limitations of current clinicnal treatments by using toxic chemodrugs, and exhibits highly attractive advantages over traditional therapies, such as the enhanced and sustained therapeutic efficacy based on the durable catalytic activity, remarkably reduced harmful side‐effects without using traditional toxic chemodrugs, and so on. Most recently, nanocatalytic medicine has been introduced in the immune‐regulation for disease treatments, especially, in the immunoactivation for tumor therapies. This article presents the most recent progresses in immune‐response activations by nanocatalytic medicine‐initiated chemical reactions for tumor immunotherapy, and elucidates the mechanism of nanocatalytic medicines in regulating anti‐tumor immunity. By reviewing the current research progress in the emerging field, this review will further highlight the great potentials and broad prospects of nanocatalysis‐based anti‐tumor immune‐therapeutics.