The design and synthesis of new materials/structures for highperformance electrochemical capacitors (ECs) is an ongoing challenge. Herein, a hierarchical porous NiCo 2 O 4 microbox superstructure made of low-dimensional substructures was reported. The as-prepared NiCo 2 O 4 microboxes are constructed by 2D nanosheets building units, which are futher woven by 0D nanoparticles and 1D nanowires. Such microbox Supercapacitors, as one efficient energy storage system, have been widely used in electric vehicles, due to its fast rechargeable rate, long cycle life, wide operating temperature range and so on. [1] While, the energy density of commercial supercapacitors is still insufficient, which seriously hinders the further practical application of supercapacitors. [2] The performance of supercapacitors is mainly affected by electrode materials and electrolytes, so the development of new materials/structures is one of the efficient ways to improve the performance for electrochemical capacitors (ECs). [3,4] Ni-Co oxide (NiCo 2 O 4 ) has attracted great interest as a promising material for superior supercapacitive properties owing to its attractive features of low cost, low toxicity, natural abundance, and diverse nanostructures. [5][6][7][8] NiCo 2 O 4 has typical crystal tip acceptance and belongs to the same cubic crystal system as Co 3 O 4 . In the crystal structure, Co 3+ from tetrahedron and Co 2+ from octahedron were replaced by low toxicity Ni 2+ , which can form Co 2+ /Co 3+ and Ni 2+ /Ni 3+ solid electron pairs to provide more active sites for redox reactions in alkaline medium. [9][10][11][12][13] Besides, this multiplex oxide has more excellent performance than single metal oxides, so the design and synthesis of NiCo 2 O 4 with novel structure and high capacitance performance becomes a research hotspot. [1,2,4,7] 53 superstructures combine the merits of all material dimensions in electrochemical capacitors, such as high porosity, sufficient active sites, and fast mass and charge transport. Benefiting from the structural advantages, the resultant NiCo 2 O 4 microbox electrode exhibits ultra-high capacitor performance, i.e., the initial capacitance of 1820 F·g -1 and 96.6 % capacitance retention after 4000 cycles at 5 A·g -1 .