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NiCo₂O₄ with higher specific capacitance is an excellent pseudocapacitive material. However, the bulk NiCo₂O₄ material prevents the achievement of high energy desity and great rate performance due to the limited electroactive surface area. In this work, NiCo₂O₄ nanosheet arrays were deposited on flexible carbon fabric (CF) as a high-performance electrode for supercapacitors. The NiCo₂O₄ arrays were constructed by interconnected ultrathin nanosheets (10 nm) with many interparticle pores. The porous feature of NiCo₂O₄ nanosheets increases the amount of electroactive sites and facilitates the electrolyte penetration. Hence, the NiCo₂O₄/CF composites exhibited a high specific capacitance of 2658 F g^–1 (2 A g^–1), good rate performance, and superior cycling life, suggesting the NiCo₂O₄/CF is a promising electrode material for flexible electrochemical capacitors.