Edge curling die for binding elastic band

The utility model relates to a hemming die for binding an elastic band. The hemming die comprises a square bottom plate, a cloth hemming device, an elastic band positioning device, an elastic band stretching device and an adjusting device, an outlet of the elastic band stretching device corresponds to the elastic band steering device; the elastic band is stretched through the square stretching shell and the left side rod of the V-shaped frame, penetrates into an inner cavity of the elastic band positioning sleeve and then penetrates out of a rear end opening of the elastic band positioning sleeve. Cloth penetrates through the space between the bottom plate and the cloth positioning plate and is folded around the elastic band positioning sleeve to form a covered edge, the covered edge wrapping the elastic band is arranged and flattened and then placed below a machine needle for sewing, so that the elastic band is automatically stretched while bedding and clothing are subjected to automatic edge covering, opera