This flame retardant sweater is designed and produced with reference to Japanese fire sweaters. The product is made of flame-retardant fiber and high-grade wool fiber. After blending and special flame-retardant treatment, it has the characteristics of flame-retardant, abrasion-resistant, breathable, and also has the advantages of warmth and comfortable wearing, and its performance indicators have reached the international level. This product is equipped with flame-resistant fiber woven fireproof cloth on the shoulder, back and lining, which increases the abrasion resistance of the product and ensures that the product does not deform. It is suitable for full-time or part-time firefighters of fire officers and soldiers at all levels and social enterprises and institutions to work in cold disaster relief environments.