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1. A high-viscosity PBT polymerization reactor, used to prepare a high-viscosity PBT melt for preparing a high-viscosity PBT/low-viscosity PET two-component elastic fiber, wherein, the high-viscosity PBT polymerization reactor is a horizontal polymerization reactor, and comprises a main body containing a chamber internally, the main body comprises a low viscosity zone, a med-high viscosity zone, and a high viscosity zone arranged in sequence along the axial direction of the high-viscosity PBT polymerization reactor, the viscosity of the PBT melt in the low viscosity zone, the med-high viscosity zone and the high viscosity zone increases in sequence; the high-viscosity PBT polymerization reactor further comprises two agitating shafts, one of which is disposed in the low viscosity zone and part of the med-high viscosity zone, and the other one is disposed in the high viscosity zone and the remaining med-high viscosity zone; a plurality of disc reactors is disposed on each of the agitating shafts, and the disc reactors in the low viscosity zone are three- to ten-disc combination; the disc reactors in the med-high viscosity zone are two-disc combination; the disc reactors in the high viscosity zone are single-disc; a plurality of homogenizers is arranged at intervals on an outer edge of each disc combination along its circumferential direction in the low viscosity zone of the high-viscosity PBT polymerization reactor and the homogenizers extend along the axial direction of the high-viscosity PBT polymerization reactor and are used to pour the PBT melt from the low viscosity zone onto the surfaces of the disc reactors.
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