The oxygen evolution reaction (OER) suffers from low intrinsic activity, poor oxidative stability, and insufficient electrical conductivity, which severely limit the practical deployment of non-precious metal electrocatalysts. To overcome these obstacles, we designed an MXene@Co(OH)₂ hybrid supported on carbon cloth (MXene@Co(OH)₂/CC) using a straightforward electrodeposition and vacuum drying method. Strong interfacial interactions between MXene and Co(OH)₂ boost charge transfer, create abundant accessible active sites, and reinforce structural integrity under OER working conditions. Consequently, the MXene@Co(OH)₂/CC electrode requires only 261 mV to achieve 10 mA·cm⁻² and shows a Tafel slope of 61.7 mV·dec⁻¹, and retains excellent performance for more than 1100 h. Beyond delivering a highly efficient and low-cost OER catalyst, this work also provides a valuable paradigm for constructing well-defined heterostructured catalytic systems via interfacial engineering.