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This solution relates to the coatings field and proposes an aqueous nano-dispersion of far-infrared negative oxygen ion material. By weight, it comprises: 300-350 parts water; 35-45 parts wetting agent; 40-60 parts dispersant; 25-35 parts defoamer; 35-45 parts multifunctional additive; 5-7 parts thickener; 400-600 parts activated far-infrared negative oxygen ion material; 1-3 parts accelerator; and 3-5 parts shielding agent. This solution designs a multi-component synergistically promoting activated far-infrared negative oxygen ion material, which can improve the hemispherical spectral emissivity in the 4-14μm band, even reaching above 0.95 in the key 8-12μm band, effectively promoting formaldehyde decomposition with a long-lasting effect, while also improving antibacterial properties.