The present invention relates to a method for preparing metal oxide-graphene nanocomposite and a method for preparing an electrode using the metal oxide-graphene nanocomposite, and the method for preparing the metal oxide-graphene nanocomposite comprises the steps of: preparing composite materials of the nanocomposite; pre-processing the composite materials so as to form graphene flakes; and hydrothermally synthesizing the pre-processed composite materials. According to the present invention, the metal oxide-graphene nanocomposite can be formed from cheap graphite through a one-step process using only a surfactant, instead of from a graphene method using high-temperature heat, thereby improving the processing steps and, simultaneously, increasing economic efficiency of processing costs. In addition, when the electrode is prepared, efficiency can be achieved through a process that does not add a conductive material using low electric resistance due to the graphene, instead of a conventional method using an active material, a conductive material and a binder. Furthermore, graphene having high purity can be prepared within a short time and, simultaneously, unary system, binary system and multicomponent metal oxides can be prepared through a one-step process using various metal oxide active materials applicable to energy storage devices, and a desired weight ratio and necessary oxide {cobalt oxide (CoO), tricobalt tetroxide (Co3O4), colbat hydroxide [Co(OH)2] or the like} can be easily prepared, and thus a very wide application range (a secondary battery, gas sensor and the like) can be expected.
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