The Franz knitting machine is designed for four-section water chestnut, and specially weaves three-line Franz cloth. The cloth surface woven is fish scale-like fabric, which is the best fabric for sportswear and casual wear. If it is treated with bristles, it can be tailored into warm-keeping clothing such as sanitary clothes, pajamas, and baby clothes. Customers who use this machine can purchase another set of water chestnut and parts of the single-sided machine, and then change the machine into a Franz and single-sided dual-purpose knitting machine for weaving single-sided fabrics. The syringe used in this dual-purpose machine does not need to be replaced, and can be used universally.