Flame-retardant polyester yarn, flame-retardant yarn, and flame-retardant fabric can not only prevent the spread of flame, but also protect the original performance of the fabric. Flame-retardant cotton yarn has good washing resistance, reliable to the human body, breathable and moisture-permeable, and soft to the touch. It is suitable for making flame-retardant protective clothing in metallurgy, machinery, forestry, fire protection and other industries. It can also be used as decorative cloth for hotels, guesthouses, opera houses and theaters. Flame-retardant yarn is a special fabric that can delay flame burning. It is mainly used to make protective clothing, special performance clothing, industrial fabrics, and is widely used in fire protection, clothing, shops, metallurgy, machinery, mining, chemicals, coal, shipping, etc. Superior combustion performance in the industry: ①Extinguish the fire immediately without continuing to burn. ②The flame retardant performance is still maintained after repeated washing. ③No toxicity, no black smoke when burning, no smell, softer than ordinary polyester, and higher color fastness.