▎ 摘　　要

NOVELTY - A filtering device for graphene grading, comprising set liquid bottle, stirring device, vacuum device, pH meter, and at least two of filter pool. The first filter pool and the second filter pool from up to down in turn and connected with connected, upper end of the first filter pool provided with feedstock mouth, the bottom filter pool are provided with filter membrane, and aperture of filter membrane are different, stirring device for setting the first filter pool and, for stirring the graphene and the first filter pool, collected liquid bottle, and filtering pool set on bottom layer is connected, and on the collected liquid bottle equipped with wrongly; vacuum device by an air connecting port and set liquid bottle connected. PH meter setting for the first filter pool and, for measuring the pH value of graphite alkene in the first filter pool. This new utility model provided by the device using different and oxidation graphene sheet different in solubility in different pH value of theory, carrying out grading for oxidation graphene on the filter process, increase of filtration efficiency, saving of time, and need not take out sample filter process of, reducing waste of the sample.