The invention relates to an aluminum electrolytic capacitor manufacturing method and an aluminum electrolytic capacitor manufactured by the method. The method comprises the steps: S01, according to the specification of an aluminum electrolytic capacitor to be manufactured, cutting a formed aluminum foil into guide strips of the corresponding specification; S02, carrying out marginalized forming treatment on the guide strips; S03, manufacturing the formed guide strips into the aluminum electrolytic capacitor. The selected formation voltage is 1.0-2.0 times, preferably 1.0-1.8 times, more preferably 1.0-1.5 times of the formation voltage of anode foil matched with the capacitor when marginalized formation treatment of the guide strips.