The utility model provides a pipe string for separate-zone production of thin oil. The pipe string for separate-zone production of thin oil comprises a first packer which is arranged at the top of the pipe string for separate-zone production of thin oil, a connecting pipe connected with the first packer, and a second packer which is connected with the connecting pipe and arranged at the bottom end of the pipe string for separate-zone production of thin oil. The pipe string for separate-zone production of thin oil is fabricated by the process based on the combination of hydraulic base seal and mechanical base seal, is applied to solve the problem that the underground return separate-zone production process is complex and has high cost, achieves the large-aperture top-sealed bottom-production process, can meet the technological requirements for through-pipe sand-washing and through-pump production, and has simplicity in construction and is low in cost.