Preparation of multi-stage pore structure layer on surface of medical titanium by using one-step anodic oxidation method

The invention relates to a preparation of multi-stage pore structure layer on the surface of medical titanium by using a one-step anodic oxidation method. A process provided by the invention comprises the step of carrying out anodic oxidation on medical titanium in a sodium acetate or potassium acetate electrolyte under the direct-current step type constant current mode so as to obtain a crystal-form titanium dioxide layer with a micron/sub-micron composite multi-stage pore structure, wherein a large pore structure is composed of micro pit structures and has a diameter of 5-20 microns, and a small pore structure is a submicron-sized micropore structure densely distributed on a whole membrane and has a pore diameter of 50-500 nm. The process disclosed by the invention is simple, economic, green and environment-friendly, and expected to be used as a surface modification method for medical titanium in the field of orthopedics, dentistry or plastic surgery.