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PROBLEM TO BE SOLVED : To provide a multifunctional catalyst additive composition and a preparation method therefor. SOLUTION : The multifunctional catalyst additive composition for reducing carbon monoxide and nitrogen oxide in a fluid-catalytic-cracking process includes : an inorganic oxide; aluminosilicate or zeolite; noble metal; group IA metal; group IIA metal; group IIIA metal; group IVA metal; group VA metal; a rare-earth oxide; and at least group VIII metal. The composition is wear-resistant and incorporated in a carrier. There is also disclosed a method for preparing a multifunctional catalyst additive composition. Further, there is also disclosed a fluid cracking catalyst including a multifunctional catalyst additive composition. COPYRIGHT : (C)2013, JPO&INPIT