The utility model discloses a flame-retardant elastic band comprising weft-wise threads and warp-wise threads. The weft-wise threads include thermal plastic rubber cords and a draw cord; the draw cord is fixedly woven in the center of the band; two ends of the draw cord are provided with edge-locking segments; one edge-locking segment, an elastic segment and another edge-locking segment are arranged on each side of the cross section of the draw cord, with the draw cord as the center; a layer of flame-retardant material is arranged outside the draw cord. The flame-retardant elastic band is good in elasticity, never deforms after repeatedly tensioned, has the elastic design and the draw cord structure, has certain flame retardance and is low in production cost and widely applicable.