The invention discloses a method for preparing a stainless steel-based micro-nano array beta-PbO2 anode material, and belongs to the technical field of metal oxide lead dioxide anode materials. The method comprises the following steps that a stainless steel plate is used as a base body for electrodeposition of a beta-PbO2 layer, an AAO template is prepared on a stainless steel-based beta-PbO2 layer, the AAO template is characterized in that the hole diameter is monodisperse, the hole length-diameter ratio is high, hole ways are distributed uniformly, the hole density is high, hole amphoteric oxide is convenient to remove, the hole ways are parallel to one another and perpendicular to the surface of a base plate, holes are independent from one another, the holes are prevented from being intersected due to hole inclination, and the controllability of the hole diameter is high, a beta-PbO2 nanowire is electrodeposited in microholes of the AAO template through an electrodeposition method,and the stainless steel-based micro-nano array beta-PbO2 anode material is obtained by dissolving the AAO template through a chemical method. The anode material prepared through the method has the advantageous performances that the stability is good, the corrosion resistance is high, the oxidizability is high, the service life is long, the conductivity is high, a large current can be conducted, the micro-nano array of the anode material has controllability, an electrochemical active surface area of an electrode can be effectively expanded, and the electrocatalysis performance can be improved.