Regarding the possible decrease in fatigue performance of aluminum alloy after sulfuric acid anodizing treatment, 7075 aluminum alloy is taken as study object. A batch of test pieces were manufactured along L and LT directions of the material for chromic acid anodizing and sulfuric acid anodizing. Detailed fatigue tests were conducted on these pieces. Fracture appearance was observed using a three-dimensional microscope. After calculating DFR of two types of anodizing on the L and LT directions based on the tests results, the results show that the fatigue fracture morphology of 7075 aluminum alloy after two anodizing treatments is consistent. DFR is also consistent. The fatigue properties of 7075 aluminum alloy after two anodizing treatments are consistent. In engineering practice, sulfuric acid anodizing can be used instead of chromic acid anodizing.