The invention relates to a modified activated carbon adsorption scavenger and a preparation method. The method includes the steps of stirring nanometer active carbon and materials evenly, adding adequate water and emulsion adhesives after mixing, stirring the mixture, and after full infiltration, drying the mixture through at a room temperature and in vacuum to obtain the scavenger. Particularly, the materials comprise, by weight, 50% to 80% of nanometer active carbon, 5% to 20% of Tourmaline powder, 1% to 10% of strong oxidant, 5% to 20 % of alkaline alumina or magnesium hydroxide and 2% to 8% of emulsion adhesive. The invention belongs to the comprehensive technical fields of environmental medicine, natural products and environmental protection, environment and human health, novel materials and the like, the scavenger is mainly used for eliminating hazards of free formaldehyde, benzene, toluene and total volatile organic compound (TVOC) in the air, so that relevant air pollution in living rooms and relatively sealed space is solved, the scavenger can continuously emit far infrared rays (The wavelength is in a range from 4 mu m to 14 mu m) beneficial to human bodies, the metabolism is promoted, the hear pressure is reduced, and the like; and the scavenger has good prevention and auxiliary therapy effects on certain diseases and is good for protecting human health.