The invention discloses a cased hole completion multi-section-fractured horizontal well selective production pipe column and a working method thereof, wherein the pipe column and the method are designed for selective and section-by-section production of a horizontal well. The outer side of a waterproof oil pipe of the pipe column is connected with a multiple-completion packer of a partition sleeve. The inner side of the waterproof oil pipe is connected with a deep well pump, a sealed inserted pipe, pressure-fixed valves corresponding to all partitions of the sleeve, a sealed cylinder and a bottom end guide plug. The upper end of the bottom-sealed pipe with holes is connected with the sealed inserted pipe. A pipe body is connected with the pressure-fixed valves in all the partitions and the sealed cylinder. During work, the horizontal well section is divided through the packer and then goes into the sealed insertion pipe and the bottom-sealed pipe with the holes downwards, the secondary sealing section is formed in the partition pipe column through combination with the sealing cylinder, the sealed insertion pipe is dragged, and horizontal section selective production and segmented production finding and water exploration are conducted. The cased hole completion multi-section-fractured horizontal well selective production pipe column can be used in a multi-stage mode, the number of stages is not limited, selective production under the condition that the sleeve is slightly changed and damaged can be achieved or section-by-section production and segmented water exploration can be achieved, the phenomenon that the whole well is flooded by water can be avoided, and a good development effect is ensured.