The metal oxide catalyst consists of carrier and active component, the carrier is one or several kinds selected from Al2O3, SiO2, TiO2, ZrO2 and CeO2 and the active component is one or more variable valency metal elements selected from Cu, Mn, V, Ce, Fe, Mo, W, Zn, Ni and Co with the carried amount being 0.1-30 wt%. It has high catalytic activity and powerful halide poisoning resisting capacity and is especially suitable for complete catalytic combustion to eliminate organic haloarene pollutant, expecially armoatic organic haloarene pollutant.