The invention relates to an electrotyping technology in holographic anti-counterfeiting printing, in particular to an electrotype splicing method, in which a large-area holographic nickel plate with high positioning precision and an optional area is formed by unit nickel plates through splicing. The unit nickel plates are obtained through replication, and medium viscosity protective film is adhered to the front surface of each unit nickel plate; any two opposite edges of each unit nickel plate are evenly cut by a plate cutter according to identical specifications; the cut edges are spliced linearly by hand, and the joints are connected through adhesive tape, so as to form a unit group; the other pair of opposite edges of each unit group is cut by the plate cutter according to the identical specifications, so that the upper and the lower edges of each unit group are evenly cut, and a large plate can be formed by the unit groups through splicing; and the plate joints on the back of the large plate are pasted through special electrotyping tape, the medium viscosity protective film is torn off, and the large plate is connected through electrotyping. The electrotype thickness is required to be above 100 microns, the connection strength is guaranteed, the splicing quality and efficiency are improved, effects from human factors are reduced, the edge cutting is controlled, fixed reserved edges are kept, and the cutting precision is ensured.