The invention provides a superfine and anti-fermite air-blowing optical cable and a fabrication method thereof, and relates to the field of anti-fermite air-blowing optical cables. The superfine and anti-fermite air-blowing optical cable comprises a loosen sleeve and an outer sheath, wherein the loosen sleeve is arranged in the center, the outer sheath sleeves the loosen sleeve, a plurality of core glass fibers are wrapped in the loosen sleeve, water blocking fiber paste or water blocking yarns are filled between the glass fibers and the loosen sleeve, and a plurality of water blocking aramidfibers are arranged between the loosen sleeve and the outer sheath. The central beam tube-type optical cable is high in fiber intensity and small in external diameter, the laying space is saved, and the anti-fermite performance demand is satisfied. According to the fabrication method of the superfine and anti-fermite air-blowing optical cable, the colored glass fibers are placed in the loosen sleeve filled with the water blocking fiber paste, or the colored glass fibers and the water blocking yarns are simultaneously placed in the loosen sleeve, and the glass fibers in the loosen sleeve have stable surplus length control and transmission characteristic by controlling pay-off speed and a temperature of a water tank; and the plurality of water blocking yarns are arranged on an outer surfaceof the loosen sleeve, to form a cable core, the outer sheath wraps the cable core, and the method is simple.