A dual-layer linear sorter comprising: a delivery mechanism being ring-shaped and configured to comprise an upper layer and a lower layer, wherein a running direction of the upper layer is a first direction, and a running direction of the lower layer is a second direction, the first direction is from one end of the delivery mechanism to the other end of the delivery mechanism, and the second direction is opposite to the first direction; wherein the delivery mechanism comprises a plurality of delivery units and a plurality of hinge parts, adjacent delivery units are hinged through one hinge part; the hinge part comprises a pair of mounting bases, a hinge shaft, a shaft sleeve and an alignment portion, a mounting base and a hinge shaft are provided on one side of one of the two adjacent delivery units, the hinge shaft is detachably connected between the pair of mounting bases, the alignment portion is provided on a side of each mounting base facing away from the hinge shaft, and one end of the alignment portion protrudes from the delivery units along an axial direction of the hinge shaft; the shaft sleeve is provided on one side of one of the two adjacent delivery units; the hinge shaft is movably sleeved in the shaft sleeve; a first feeding mechanism being close to the upper layer of the delivery mechanism and being docked with one end of the delivery mechanism; a second feeding mechanism being close to the lower layer of the delivery mechanism and being docked with the other end of the delivery mechanism; a slewing mechanism being connected to one end of the delivery mechanism; and a driving mechanism being connected to the other end of the delivery mechanism; wherein the driving mechanism is configured to drive the delivery mechanism to circulate in a loop between the driving mechanism and the slewing mechanism, a part of goods are delivered to the upper layer of the delivery mechanism via the first feeding mechanism, and are delivered and sorted along the first direction, another part of the goods are delivered to the lower layer of the delivery mechanism via the second feeding mechanism, and delivered and sorted in the second direction. a delivery mechanism being ring-shaped and configured to comprise an upper layer and a lower layer, wherein a running direction of the upper layer is a first direction, and a running direction of the lower layer is a second direction, the first direction is from one end of the delivery mechanism to the other end of the delivery mechanism, and the second direction is opposite to the first direction; wherein the delivery mechanism comprises a plurality of delivery units and a plurality of hinge parts, adjacent delivery units are hinged through one hinge part; the hinge part comprises a pair of mounting bases, a hinge shaft, a shaft sleeve and an alignment portion, a mounting base and a hinge shaft are provided on one side of one of the two adjacent delivery units, the hinge shaft is detachably connected between the pair of mounting bases, the alignment portion is provided on a side of each mounting base facing away from the hinge shaft, and one end of the alignment portion protrudes from the delivery units along an axial direction of the hinge shaft; the shaft sleeve is provided on one side of one of the two adjacent delivery units; the hinge shaft is movably sleeved in the shaft sleeve; a first feeding mechanism being close to the upper layer of the delivery mechanism and being docked with one end of the delivery mechanism; a second feeding mechanism being close to the lower layer of the delivery mechanism and being docked with the other end of the delivery mechanism; a slewing mechanism being connected to one end of the delivery mechanism; and a driving mechanism being connected to the other end of the delivery mechanism; wherein the driving mechanism is configured to drive the delivery mechanism to circulate in a loop between the driving mechanism and the slewing mechanism, a part of goods are delivered to the upper layer of the delivery mechanism via the first feeding mechanism, and are delivered and sorted along the first direction, another part of the goods are delivered to the lower layer of the delivery mechanism via the second feeding mechanism, and delivered and sorted in the second direction.