The invention provides a garment steamer which comprises a body, an ironing head, a steam guide pipe connecting the body with the ironing head and an ironing and color fading prevention device. The ironing and color fading prevention device can be used for containing smoothing agents, the smoothing agents can be sprayed to ironed clothes, and the smoothing agents can reduce friction between the ironing head and the ironed clothes and/or reinforce color firmness of dye on the ironed clothes. According to the garment steamer, due to the fact that the ironing and color fading prevention device used for containing the smoothing agents is arranged, the smoothing agents can be sprayed to the ironing head and the surfaces of the ironed clothes when the clothes are ironed, the friction between the ironing head and the ironed clothes is reduced, the color firmness of the dye on the ironed clothes can be reinforced at the same time, the problems that the color of ironed clothes fades and changes when the clothes are ironed are avoided by reducing the ironing friction and reinforcing the color firmness of the dye, the color stability of the ironed clothes can be improved effectively, and the situations that fallen dye contaminates the garment steamer and causes cross color fading and dyeing among the ironed clothes are avoided.