The invention relates to a sweater with a stain-resistant function. The sweater is formed by weaving blended yarns, wherein the blended yarn is formed by cashmere, tencel wool, modal fibers, and cotton. Mass portion of each component is 12-20 parts of cashmere, 40-60 parts of tencel wool, 15-25 parts of modal fibers, and 5-13 parts of cotton. Fulling treatment, washing treatment, drying treatment, and pressing treatment are performed on a woven sweater, wherein temperature in the drying treatment process is kept in 40 DEG C. The sweater is characterized in that the cashmere, the tencel wool, the modal fibers, and the cotton contain a stain-resistant auxiliary agent. The sweater is advantaged in that the cashmere, the tencel wool, the modal fibers, and the cotton contain the stain-resistant auxiliary agent, so that the sweater has good stain-resistant performance, and the sweater does not easily be stained with dusts, and is stain-resistant and is easy to wash.