The utility model provides a bottom cutter structure used in a bathroom tissue folding roller. The bottom cutter structure used in the bathroom tissue folding roller comprises a bottom cutter body, a cutting edge portion of the bottom cutter body is in an unilateral inclined structure, a plurality of air intake holes are arranged in the bottom cutter body along the length direction of the bottom cutter body, and each air intake hole penetrates along the cutter back direction of the cutting edge of the bottom cutter body. According to the technical scheme, since the cutting edge is arranged in the unilateral inclined structure, the area of the cutting edge is enlarged, and tissue cutting accuracy can be effectively improved; at the same time, a tissue folding groove which used to be a V-shaped groove is changed to be similar to the shape of a lying V, when bathroom tissue is folded, friction of the tissue folding groove to the bathroom tissue is small, and therefore the problem that stacked tissue curls or is folded can be effectively avoided, and the tissue is high in uniformity; and moreover, the more important point is that since the plurality of air intake holes are arranged in the bottom cutter body, the bottom cutter structure used in the bathroom tissue folding roller is enabled to have an air intake function besides being matched in tissue cutting.