The present invention relates to a catalyst for sweetening FCC gasoline. The catalyst comprises an alumina carrier having a macroporous structure and the metal active components nickel and molybdenum supported on the carrier, the alumina carrier having the macroporous structure is 66-91 wt% by weight percentage, the carrier contains auxiliary components phosphorus and magnesium, the pore size distribution is 60-180nm, the pore ratio is 2-75%, the pore volume 0.8-2.0 ml/g, and specific surface area is 250-300 m<2>/g. The content of nickel oxide is 5-19 wt%, and the molybdenum oxide content is 2-15wt%. The catalyst has the advantages of high sweetening activity, high hydrogenation selectivity of diolefin, and less loss of octane value.