The invention discloses an adsorbing material for cigarette filter and the preparation method. Fresh grapefruit peel is prepared and cleaned, and impurities and dirt are removed. The grapefruit peel is soaked in hydrogen chloride solution and added into hydrogen peroxide accounting for 0.1 to 2 permillage of the solution with the concentration of 30 percent, and then heated to the temperature ranging from 40 to 50 DEG C, kept at constant temperature for 8 hours, and filtered. After being cleaned by clear water, the grapefruit peel is dried under the condition of 50 to 60 DEG C for 5 to 8 hours, comminuted to form fine particles and filtered through a sieve with 20 to 80 meshes, thus obtaining the absorbing material required. Since natural plant material is adopted, the prepared absorbing material has quite good tenacity, which is beneficial to the formation of a filter stick and the production of cigarettes, and does not cause the wear of equipment; the absorbing particles has loose and porous cavum structure and comparatively large specific surface area, and is applied to the cigarette filter so as to be capable of effectively removing injurious ingredients, such as tar, NNK, benzo(a)pyrene, etc.