Based　on　the　increasingly　serious　formaldehyde　pollution,　effective　degradation　of　formaldehyde　has　become　a　practical　problem　that　humans　urgently　need　to　solve.　Among　many　treatment　methods,　activated　carbon　has　the　advantages　of　large　specific　surface　area,　high　adsorption　efficiency,　and　uniform　pore　size　distribution.　As　a　kind　of　clean　photocatalytic　material　for　formaldehyde　degradation,　titanium　dioxide　supported　by　activated　carbon　has　become　a　research　hotspot　to　develop　adsorption-catalytic　materials　for　formaldehyde　degradation.　In　this　paper,　the　research　progress　of　activated　carbon　and　its　modification,　the　photocatalytic　principle　and　modification　of　titanium　dioxide,　and　TiO2/AC　materials　are　reviewed.　The　results　show　that　the　pore　size　distribution　gradient　and　acidic　oxygen-containing　functional　groups　of　activated　carbon　play　key　roles　in　the　formaldehyde　adsorption　process.　TiO2　doped　with　metal　ions　and　nonmetal　ions　can　significantly　improve　the　photocatalytic　activity.　The　TiO2/AC　material　can　greatly　improve　the　photocatalytic　rate　and　achieve　the　technical　goal　of　efficient　and　clean　degradation　for　formaldehyde.　©　2021　Xinwei　Zhu　et　al.