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Oxidative stress occurs when excess oxidative free radicals are produced in cells, which can overwhelm the normal antioxidant capacity and play an important role in many disease states. Thus, advanced functional materials which can mimic the intracellular antioxidant defense system have a huge potential to become candidates for curing oxidative stress triggered diseases. Herein, a high‐performance nanoplatform is developed with a green and mild strategy by combining mimic‐enzymatic antioxidant (Fe₃O₄) and nonenzymatic antioxidant (tannic acid (TA)) for constructing antioxidant defense system (Fe₃O₄ @ TAn nanoflowers (NFs)). Owing to the excellent peroxidase (POD)‐mimic and catalase (CAT)‐mimic capacities of Fe₃O₄ in various conditions, the antioxidant ability of TA and the flower‐like morphology, the Fe₃O₄ @ TAn NFs can effectively scavenge multiple reactive oxygen and nitrogen species …