The invention discloses a method and a device for after-finishing of various textiles and non woven fabrics through the plasma treatment technology. Various textiles and non woven fabrics are fed in through a group of fabric clamping rollers, and electro discharge treatment is carried out through a carrier roller rotating electrode fixed on a stand and a discharge channel of a plasma generator connected with an electric control box. Under the action of electric ions, the molecular characteristics of the textiles are changed, hydrophilcity, adhesiveness and proportionality of the textiles are increased, and the after-finishing process is carried out. For after-finished textiles through the plasma electro discharge treatment, the color fastness and the colorfulness of textile printing are increased. During coating, because the textiles have no dirt or dust, the adhesiveness is strong, the coating is even and is not easy to degum. The adhesion degree is increased during compounding, the textiles are not easy to degum and scale off and not easy to blister. According to the process, the quality of the textiles is greatly improved, and the economic benefit is increased. A large amount of ozone gas generated during the electro discharge treatment process of the various textiles and the non woven fabrics is absorbed through an ozone collector.