The invention relates to a waste-gas desulfurization mixed carrier catalyst and a preparation method thereof. The catalyst is characterized in that alumina and honeycomb activated carbon are used as amixed carrier on which active components are loaded, wherein the active components include ferroferric oxide and titanium dioxide; the catalyst comprises the following components: 65-80wt% of mixed carrier, and 20-35wt% of ferroferric oxide and titanium dioxide; the mass ratio of ferroferric oxide to titanium dioxide is 3-5: 1. With the adoption of the catalyst, the blockage caused by dust can beavoided; and the catalyst is high in desulfurization activity.