The invention belongs to the field of supercapacitors, and particularly relates to plush-surface ferric oxide nanotube array material and a preparation method thereof. The material has a plush tubular structure and is evenly deposited on the surface of a titanium sheet or stainless steel substrate, wherein the length of deposition arrays is 2-4 microns and the diameter is 50-100nm. According to the method, cobalt hydroxide nanowire arrays are prepared by adopting a solvent thermal synthesis method with cobalt nitrate acting as a cobalt source and urea acting as a precipitating agent, based on the pervious steps, the cobalt hydroxide nanowire arrays are immersed in a ferric nitrate or iron chloride solution with cobalt hydroxide acting as a sacrificial template and the titanium sheet or stainless steel acting as the substrate and then the plush tubular ferric oxide array material is prepared through further sintering.