The invention provides a method for laying paper on a slab. The method is simple and efficient in operation. A mechanism, provided with a front-and-back moving device, a lifting device, a paper sucking device, a paper storage frame and an air blowing device, for laying the paper on the slab is used. The front-and-back moving device is arranged on a rack in a moving manner. The lifting device is arranged on the front-and-back moving device. The air blowing device is provided with air blowing openings which are located in the front side and the rear side of the paper storage frame and used for blowing air to a paper pile on the paper storage frame. The air blowing openings are formed in an air blowing opening support which can move up and down relative to the paper storage frame. Suction cups are arranged on the lifting device in the manner that the suction cups can swing in the front and back direction. In use, the suction cups suck decorative paper placed on the paper storage frame, get close to the front end of a production line in the front and back direction, move forwards to reach the assembly line and then lay down the decorative paper; and the front and back moving device retreats, and the suction cups suck the decorative paper placed on the paper storage frame, keep away from the rear end of the production line in the front and back direction, move forwards to reach the assembly line and then lay down the decorative paper. The upper surface of the decorative paper is the lower surface of the decorative paper on the paper pile.