The invention relates to a method for preparing natural plant granular materials for filter tips, which comprises the steps of: taking dry plant stem pith, removing impurities and pulverizing and sieving the stem pith to obtain powdery materials with the mesh number greater than 80 meshes; uniformly mixing the powdery materials and auxiliary materials according to the proportion of the mass ratio being 10/10 to 0, obtaining the powdery mixed materials, stirring and uniformly mixing the powdery mixed materials by ethanol solution or water according to the proportion of the material liquid ratio being 4 to 0.5/1 and making the mixed materials into soft materials; or stirring and uniformly mixing the powdery mixed materials and water solution of the auxiliary materials according to the proportion of the material liquid ratio being 4 to 0.5/1 and making the mixed materials into soft materials; carrying out extrusion type granulation on the soft materials, and then drying granules; and sieving the dried granules by a sieve of 20 to 80 meshes, and the required natural plant granular materials for the filter tips are obtained. The natural plant granular materials for the filter tips prepared by the method has the advantages that when natural plant stem pith granules are thinner, static electricity and agglomeration properties can be eliminated, the powder granulation performance is enhanced, and the addition operability of the natural plant stem pith granular materials during the cigarette filter stick manufacture is improved.