Abstract: Nickel-cobalt metal-organic framework(Ni-Co-MOF)/graphene oxide(GO) precursors were prepared by solvothermal synthesis with mass ratios of nickel and cobalt metal salts to GO of 1：0.05, 1：0.07, and 1：0.09, respectively, and then were ultrasonically sprayed on the heated nickel foam substrate to obtain NiCo₂O₄/reduced graphene oxide(rGO) composite electrode materials. The microstructure and electrochemical properties of the composites were studied. The results show that the NiCo₂O₄/rGO composite was composed of wrinkled graphene and NiCo₂O₄ nanoparticles uniformly distributed on graphene surface. When the mass ratio of salt to GO was 1：0.07, the composite had a high specific capacitance of 991 F·g^-1 at a current density of 2 A·g^-1; after 30 000 cycles of charge and discharge at a current density of 20 A·g^-1, the initial capacitance retention was still as high as 126%. The assembled NiCo₂O₄/rGO//AC asymmetric supercapacitor had an energy density of 41 W·h·kg^-1 at a power density of 1 604 W·kg^-1, and achieved capacitance retention greater than 100% after 25 000 charge/discharge cycles, showing an ultra-long cycle life.