The invention discloses a high-dispersion nano-composite catalyst, and a preparation method and applications thereof. The high-dispersion nano-composite catalyst comprises nano-composite with the dimension of 1-10nm, according to the total weight of the composite as standard, the composite comprises ingredients in percentage by weight: 1-20% of reactive metal oxide, 0-20% of basic oxide promoter, 0-20% of oxidized reducing auxiliary, and 40-99% of zirconium dioxide carriers, the weight percentage sum of the ingredients is 100%. The catalyst has the advantages of being high in dry reforming catalytic activity of methane, good in stability, strong in sintering resistance capability, difficult for carbon accumulation and simple in process, and the like, when being used for reaction of the dry reforming of methane through carbon dioxide.