The invention provides a lignin-based air formaldehyde removal material and a preparation method thereof. The lignin-based air formaldehyde removal material is obtained through adding a treated ligninmatrix material into a sol formed by mixing acetylacetone or diethanolamine, titanium alkoxide, zinc oxide, a pore former, absolute ethanol and distilled water, carrying out ageing and drying to obtain a lignin-containing sol material, adding water solution of soluble salt of a precious metal, and adding N,N-dimethylformamide or pyrrolidone for a reflux reaction. According to the method, lignin is used as a matrix material, a titanium dioxide photocatalyst and a precious metal catalyst are loaded at the same time, and the lignin and the photocatalyst are modified at the same time, so that theadsorption performance of the material is improved, the ability of degrading the pollution in the air via cooperation of photocatalytic and noble metal catalytic oxidation is improved, and the air purification efficiency is significantly enhanced.