The present invention is highly dispersed precious metal-supported mixed metal oxide removal catalyst and its relates to a manufacturing method, and more particularly, the zeolite carrier catalyst containing a noble metal, an alkaline earth metal oxide and mixed metal oxide is a supported layered inorganic oxide of the rare earth metal oxide after mixing the carrier catalyst ratio specified, the chemical performing a formula method, deactivation of the precious metals due to the poisoning caused matter contained in the mixed gas mixed metal oxide contained in the layers of the layered inorganic oxides including oxides of nitrogen calcining suppressed by improving the efficiency of selective removal of nitrogen oxides, also expressed a mildly widening effect the temperature range at the time of elimination reaction, anchorage, such as a gas turbine or boiler using natural gas as a heat source and a lean burn (lean-burn) car for the removal of nitrogen oxides contained in the exhaust gas discharged from the transfer-source, such as a noble metal dispersion relates to a high-effective-supported mixed metal oxide removal catalyst and a preparation method thereof. Precious metals, zeolites, alkaline earth metal oxides, rare earth metal oxide, an inorganic oxide layer, the denitration catalyst