The invention discloses an azoic copper complex water oxidizing catalyst and belongs to the technical field of chemical catalysts. The water oxidizing catalyst is a 1-(2-pyridineazo)-2-naphthol (PAN) copper (II) complex which is a penta-coordinative compound formed by 1-(2-pyridineazo)-2-naphthol and Cu<2+> in a coordination manner. The complex contains trifluoromethane sulfonate coordination and is 477.97 in molecular weight. The 1-(2-pyridineazo)-2-naphthol (PAN) copper (II) complex water oxidizing catalyst is stable in structure, is low in cost, is excellent in effect on reaction of preparing oxygen from water through catalytic oxidization, and has excellent catalytic effects in various solvent systems.