NiCo₂O₄ nanomaterials exhibit great potential in the fields of energy storage and conversion especially in supercapacitors for their unique physicochemical properties. Given the important impact of morphology of nano material on its performance, this review focuses on preparation methods and application of NiCo₂O₄ nanostructure with various morphologies including nanoneedle, nanowire, nanotube, nanosheet, sphere, nanoflower, coral-like structure and three-dimensional hybrid structure. Furthermore, the influence of morphology and particle size of NiCo₂O₄ on its properties is also introduced. Finally, the future research direction of NiCo₂O₄ nanomaterials in the fields of energy storage and conversion is prospected.