The invention discloses a series connection ink fountain roller. The series connection ink fountain roller comprises a supporting mandrel and a plurality of ink fountain rings which are connected to the supporting mandrel in a sleeved mode and connected in series in the axial direction of the supporting mandrel. The ink fountain rings are not connected with one another and form the ink transmission surface of the ink fountain roller together. The diameters of the ink fountain rings are the same and correspond to the position of a certain section in an ink fountain respectively. In the ink transmission process, all the ink fountain rings simultaneously rotate at the same rotating speed and the same rotating angle, wherein the relative position of each ink fountain ring and the supporting mandrel is kept unchanged. The ink transmission surface of the ink fountain roller is formed by the ink fountain rings which are not connected with one another, only ink making contact with each ink fountain ring is taken away form the position of the ink fountain ring, and therefore ink feeding in the given positions is achieved; when multiple colors of ink are simultaneously stored in the ink fountain, the axial positions of the ink fountain rings can be adjusted for the series connection ink fountain roller according to the requirements, each ink fountain ring only makes contact with one color of ink, an end face sealing method is adopted for each ink fountain ring and the color isolation ink fountain, the existing color isolation principle is improved, and the quality problem caused when different colors of ink are mixed is effectively solved.