The work aims to study fretting wear behavior of micro arc oxidation (MAO) coatings on the surface of aluminum alloy being oxidized for different time under electrical contact conditions. By controlling oxidization time (10, 20, 30, 40, 50, 60, 70 min), MAO coatings exhibiting different surface states were prepared on the surface of aluminum alloy. Changes in contact resistance under electrical contact conditions were studied in a four-probe method. The fretting wear mechanism was revealed by analyzing friction coefficient, F-D curve, worn morphology, 3D profile and grinding crack chemical composition. Wear resistance of the MAO coatings being oxidized for different time varied significantly under the same electrical contact fretting wear conditions, and further affected the electrical contact behavior. The coating being oxidized for 10 min was worn the most seriously, coating in the worn area failed rapidly and the aluminum alloy substrate was even exposed, and contact resistance decreased rapidly. The coating being oxidized for 50 min was the thickest and had good wear resistance, the contact resistance attenuated slowly, and the contact resistance curve fluctuated in the process of attenuation under the effect of cracks on grinding cracks. Oxidation time can affect surface morphology, thickness and roughness of MAO coatings, and it had a great influence on fretting wear behavior of the coatings under electrical contact conditions.