Binary composites (ZIF-67/rGO) were synthesized by one-step precipitation method using cobalt nitrate hexahydrate as metal source, 2-methylimidazole as organic ligand, and reduced graphene oxide (rGO) as carbon carrier. Then Ru³⁺ was introduced for ion exchange, and the porous Ru-doped Co₃O₄/rGO (Ru-Co₃O₄/rGO) composite electrocatalyst was prepared by annealing. The phase structure, morphology, and valence state of the catalyst were analyzed by X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). In 1 mol·L^-1 KOH, the oxygen evolution reaction (OER) performance of the catalyst was measured by linear sweep voltammetry, cyclic voltammetry, and chronoamperometry. The results show that the combination of Ru doping and rGO provides a fast channel for collaborative electron transfer. At the same time, rGO as a carbon carrier can improve the electrical conductivity of Ru-Co₃O₄ particles, and the uniformly dispersed nanoparticles enable the reactants to diffuse freely on the catalyst. The results showed that the electrochemical performance of Ru-Co₃O₄/rGO was much better than that of Co₃O₄/rGO, and the overpotential of Ru-Co₃O₄/rGO was 363.5 mV at the current density of 50 mA·cm^-2.