Compared with crystalline catalysts, the feature of more unsaturated coordinated atoms and higher surface energy boosts the electrocatalytic performance of amorphous catalysts. Herein, an amorphous nickel carbonate, a urea oxidation reaction (UOR) catalyst, was synthesized via a facile precipitation approach. The UOR catalysis on the as-synthesized amorphous nickel carbonate mainly follows the indirect chemical-oxidation path. When employed in UOR catalysis, the as-synthesized amorphous nickel carbonate decorated on glass carbon electrode delivers a current density of 117.69 mA·cm−2 at 1.6 V vs. RHE with a small Tafel slope of 40.7 mV·dec-1, which is comparable to the most active reported catalysts. This work proposes a facile method to synthesize an efficient amorphous nickel carbonate UOR catalyst.