The invention discloses a rotary screen suede foaming wallpaper pulp and a preparation method thereof, wherein the pulp comprises DOP/DOTP, a potassium-zinc stabilizer, a AC foaming agent, titanium dioxide, PVC, a paste resin, calcium carbonate, a reinforcing agent, and OB. According to the present invention, the prepared pulp can improve the strength and the elongation of the finished product wallpaper, can improve the wear resistance of the product and the surface finish of the material, and can enhance the aging resistance of the product; and by selecting different foaming agents according to different foaming requirements, the finished product wallpaper having different layers can be obtained, such that the product can have the diverse market selectivity, and the method can be widely used for the production of the wallpaper pulp.