The invention provides a method for reducing the carbon monoxide release amount of papermaking-reconstituted tobacco. The method comprises the steps that soluble Fe3+ salt or Cu2+ salt or an aqueous solution of Fe3+ salt and Cu2+ salt is added into bentonite, so that the bentonite is loaded with 0.1-5.0% of Fe3+ or Cu2+ or Fe3+ and Cu2+, and filtering and drying are conducted; the mixture is roasted for 3-5 h at the high temperature of 600-800 DEG C, and the modified bentonite is obtained after cooling; the modified bentonite is added into coating liquid in the weight ratio of 5-20% during papermaking-reconstituted tobacco production and fully stirred to be uniform, the subsequent coating, drying and slicing procedures are started, and a functional reconstituted tobacco product is obtained. The method can avoid the problems that the bentonite loss is caused and the utilization rate is low in the reconstituted tobacco slurry preparation step; meanwhile, the loaded ferric oxide or copperoxide component with a catalytic oxidation function is modified and works together with a porous loose physical structure, with a large surface area, of bentonite, so that the carbon monoxide releaseamount of the paper-making reconstituted tobacco is effectively reduced.