The invention discloses a filter tip stick for a low-tar cigarette. A preparation method comprises the following steps of: (1) grinding expansive tobacco stem granules and sieving, and selecting expansive tobacco stem granules with particle sizes of between 20 and 80 meshes; (2) loading one or more than one humectant of oligomaltitol, D-pyranylgalacturonic acid, L-pyrrolidone carboxylic acid-Na, propylene glycol, glycerol, xylitol, sorbierite, Amimethylglycine, 1,3-butanediol, D-pyrane and honey on the expansive tobacco stem granules, and regulating the moisture content to be between 6 and 12 percent, wherein the humectant accounts for 0.5 to 2 percent of the weight of the expansive tobacco stem granules; (3) loading a top dressing flavor which is the same as a top dressing flavor used for preparing cut tobacco of a cigarette on the expansive tobacco stem granules; (4) spreading the expansive tobacco stem granules on nonwoven filter cloth or a paper filter element according to the adding amount of between 0.8 and 3,5mg/mm, and coiling to form a material stick; (5) coiling a white stick by using diacetate cellulose tows; and (6) alternately compounding the material stick and the white stick, wherein the white stick is close to a lip end, and the material stick is close to a cut tobacco end of the cigarette. The filter tip stick for the low-tar cigarette has the effects of reducing harm and tar and improving smoking quality of cigarettes.