The activated carbon filter is made of aluminum honeycomb, plastic honeycomb and paper honeycomb with through-hole structure as the carrier and filled with a certain amount of activated carbon granules. It has the characteristics of large specific surface area, high adsorption efficiency, low air resistance and low energy consumption, can be used to remove formaldehyde, benzene, toluene, hydrogen sulfide, ammonia and other volatile organic pollutants in the air.