The invention discloses a small-
diameter cotton sliver and a preparation method thereof, and belongs to the technical field of hygienic products. Firstly, modified cotton fibers are carded, stacked, shaped and
cut to obtain cotton
fiber layers, then non-
woven fabric is adopted for wrapping and pressing, then the strip-shaped
fiber layers are sewn, fixed and curled into small-
diameter cylinders through sewing threads, and the small-
diameter cylinders are pressed, formed, compressed and loaded into a guide
pipe to obtain the small-diameter cotton sliver. The present invention relates to a small-diameter
tampon which can better help low-menstrual-volume women, green hands or sensitive users to smoothly transition to the use of tampons, improving the overall quality of their menstrual life, and which also has a better ability to absorb and secure
menstrual blood, despite a reduced diameter, ensures that the
tampon still has good ability to absorb and secure
menstrual blood, and thus makes it possible to improve the overall quality of their menstrual life. The problem that a small-size cotton sliver possibly has insufficient absorption performance is solved.