The invention discloses a double-twisting and sanding integrated machine for chemical fiber filaments. The double-twisting and sanding integrated machine comprises a double-twisting spindle and a sanding device, wherein the double-twisting spindle and the sanding device are mounted on a machine body; a double-roll roller is arranged at the top of the sanding device and is movably connected to themachine body, a friction roll is arranged at the top of the double-roll roller, and the friction roll is mounted on the machine body; and the sanding device comprises a yarn guiding porcelain component, a sanding cover, a sanding grinding wheel, a sanding seat and an air ring. By adjusting the height of the sanding device and the interval between the air ring in the sanding device and the yarn guiding porcelain component, ideal feathers can be obtained in a filament double-twisting link; and by controlling the sanding quantity, the outer surfaces of filaments are directly sanded when twisted chemical fiber filament products are twisted by virtue of double-twisting machine, and proper adjustment can be carried out according to the demands, so that the procedure is shortened, the cost is saved, and the problems that procedures of producing the filaments with the feathers from chemical fiber filaments are more, the production time is long, and the cost is high are solved.