A method for preparing a master plate with rainbow holographic images and special holographic images comprises the following steps: (1) splicing a rainbow holographic plate and a special holographic plate together to form a spliced plate; (2) agglutinating the spliced plate obtained from step (1) onto a circular roller to form a printing roller; (3) pressing the printing roller onto the side of aplastic membrane with a carrier, so that holographic image information on the spliced plate is copied onto the carrier of the plastic membrane; (4) electroforming a layer of nickel on the carrier to form a nickel-metal layer, and then stripping the nickel-metal layer from the plastic base material, so as to obtain the master plate with the rainbow holographic images and the special holographic images. In the invention, since the spliced plate is agglutinated on the circular roller, and the base material is wrapped on a pressing roller at the time of pressing, that is, the holographic image information on the splicing plate is copied onto the base material through a method of pressing a round body with another round body, large-sized spliced plates can be used to adapt to the characteristics that the rainbow holographic plate is large in breadth and to splice the rainbow holographic images and the special holographic images together.