In this paper, a stepwise synthesis method was used to synthesize a glycine acid Schiff base copper complex catalyst to catalyze carbonyl hydrazine removal of DO in feedwater. The effects of reaction temperature, pH, mass concentration of catalyst, and carbonyl hydrazine dosage on the catalytic deoxygenation performance were investigated and the optimum conditions were determined. When the reaction temperature is 45 ℃, the dosage of carbonyl hydrazine is 2 times the theoretical amount, the initial pH of the solution is 8, and mass concentration of catalyst is 0.01 g/L, the removal rate of DO reaches 94.8% after 5 minutes of reaction. At the same time, the structure of the catalyst was characterized by elemental analysis, IR, and UV spectrometry. Cu and glycine Schiff base ligand are coordinated, and —CN—, —COO—, Ar—O— participate in the coordination with Cu. The complex can react with DO quickly at low and room temperatures for removing DO in water.