The invention discloses a sulphur vacancy richened Ni3S2 nanorod oxygen evolution electro-catalysis material and a preparing method and application thereof, and belongs to the field of electrolytic water catalysis. The preparing method comprises three steps that firstly, a precursor film layer is prepared through anodic oxidation treatment of a nickel sheet; secondly, the precursor film layer is subjected to annealing treatment to obtain oxygen vacancy richened NiO film layer; and finally, the film layer obtained after annealing is subjected to hydrothermal sulfidizing to obtain the sulphur vacancy richened Ni3S2 nanorod oxygen evolution electro-catalysis material. As the existence of the sulphur vacancy, energy barriers needing to be overcome by a midbody on adsorption or desorption on the catalyst surface are reduced, and the oxygen evolution catalytic performance is greatly improved. Sulphur vacancy richened Ni3S2 nanorods grow on a nickel substrate in situ, the resistance between acatalyst and the substrate is reduced, and meanwhile, the oxygen evolution catalyzing stability is improved. The method is simple in operation, the requirement for preparing equipment is low, the material is environment-friendly, the preparing method has generalizability, and the development and application of the transition metal sulfide catalyst are further promoted.