A method of manufacturing a damper of a loudspeaker includes the steps of: immersing a fiber cloth with a resinous solution containing resin and formaldehyde catching agent, wherein the resin comprises formaldehyde while the formaldehyde catching agent reduces the amount of formaldehyde in the resin; drying the immersed fiber cloth; forming the dried fiber cloth to a configuration similar to a shape of the damper; and cutting the dried fiber cloth along the shape of the damper, thereby obtaining the damper having low formaldehyde content.