The invention discloses single-surface PEK (Polyether Ketone) coated release paper which comprises bottom-layer paper and a coated layer, wherein the coated layer is directly arranged on the single surface of the bottom-layer paper in parallel; the bottom-layer paper is made of all-wood paper; the coated layer is formed by the injection molding of polyethylene; and the external surface of the coated layer is a rough surface on which a plurality of small holes are formed evenly. Therefore, the surface roughness of the coated layer is enhanced, i.e., the coated layer can be firmly bonded with an adhesive tape; and the coating of a silicone oil layer is not required, so that the transferring of the silicone oil layer is avoided, i.e., the coated layer is easy to bond and peel off. Consequently, the phenomenon that the coated layer cannot be peeled off well is avoided; and the flatness and the toughness of the release paper are improved. As a result, the release paper is difficult to deform and the service life of the release paper is prolonged.