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The diatomite as the main raw material and TiCl4 as the source of titanium, hydrolytic precipitation method was used to prepare a new type of environmentally friendly material--nano-TiO2/diatomite-based porous ceramsite composite material. Its formaldehyde removal effect in a 1 m³ environmental chamber was tested. The results showed that the composites had good removal effect for formaldehyde under ultraviolet light, and the removal rate of formaldehyde was the highest 97.8% at 120 min. If the composites is used as an air purifier core, it will play a positive role in solving the air pollution problem of newly renovated houses. [ABSTRACT FROM AUTHOR]