The invention provides a method for preparing an AgO oxygen evolution catalyst membrane material exposing different crystal faces under a mild condition. According to the specific scheme, a complexingagent which can achieve complexation with Ag+ is added into a potassium nitrate solution so that the metal existing form of Ag+ in the solution can be changed, the pH of the solution is also changed,and meanwhile the complexing agent can serve as a proton barrier; in-situ deposition is carried out through a potentiostatic method, the Ag-base oxygen evolution catalyst membrane material can be obtained, and when the addition amount of the complexing agent is different, the exposed crystal faces of the obtained Ag-base catalysts are different. The Ag-base oxygen evolution catalyst exposing theexcellent crystal faces prepared through the method achieves relatively low overpotential, relatively high catalytic activity and stability can still be shown after six hours of electrolysis under thealkaline condition, a novel anode oxygen evolution material is provided for water-electrolytic hydrogen making, the preparation method can serve as an effective means of adjusting and controlling specific crystal faces of other metal oxygen evolution catalysts, and wide application prospects are achieved.