Preparation method of porous aluminum oxide template

The invention discloses a preparation method of a porous aluminum oxide template and belongs to the technical field of nanoimprinting. The method particularly includes following steps: cleaning a surface of an aluminum sheet, performing electrochemical polishing in an electrochemical solution composed of perchloric acid and ethanol, and finally performing oxidation for two times to the aluminum sheet. In the method, the aluminum sheet is free of treatment at a high temperature and under a high pressure when the aluminum oxide template is prepared so that a preparing time is reduced. In addition, the porous aluminum oxide template is high in ordered degree and is uniform in size and distribution.