Oxygen evolution reaction (OER) is considered as the bottleneck half reaction in water splitting, owing to it involves transfer of multiple electrons and the kinetics is slow. Therefore, the development of efficient and stable electrocatalysts for OER and the reduction of the applied overpotential are the key to the development of water splitting technology. In this work, porous amorphous NiCo oxide catalyst for OER was fabricated by simple chemical bath deposition and low-temperature roasting method, using this preparation method, yielding amorphous NiCo oxide with quality up to gram level. Amorphous NiCo oxide exhibites excellent OER performance than its crystalline counterpart NiCo2O4 spinel oxide due to its oxygen vacancy. The holey amorphous NiCo oxide exhibites a low overpotential of 370 mV at current density of 10 mA/cm2 and excellent stability in 0.1 mol/L KOH while maintains remarkable durability.