A lifting column, comprising a telescopic transmission assembly comprising: a first stage rod, a second stage rod, a first stage casing, and a second stage casing, wherein the second stage rod is formed in a hollow structure having an inner surface and an opposite, outer surface and a through hole defined by the inner surface, the outer surface being provided with external threads, and the inner surface being devoid of threads; wherein the first stage rod is disposed in the through hole of the second stage rod and adapted to drive the second stage rod to rotate synchronously, such that the first stage rod and the second stage rod are telescopically expandable or contractible relative to each other along an axial direction; wherein the first stage casing is provided with a first transmission nut, the external threads of the second stage rod being in a screw-thread fit with the first transmission nut; and wherein the second stage casing sleeves over the first stage casing, the second stage casing being provided with a second transmission nut, the first stage rod being in a screw-thread fit with the second transmission nut, and the second stage rod being positioned with the first transmission nut in the axial direction in a rotatable manner, characterized in that: the lifting column further comprises an inner tube, a middle tube, an outer tube, a housing fixedly connected onto an upper end of the inner tube, and a driving device arranged in the housing, the telescopic transmission assembly is sheathed by the inner tube that is, in turn, sheathed by the middle tube that is, in turn, sheathed by the outer tube; and the driving device is adapted to drive the telescopic transmission assembly, wherein the driving device is mechanically coupled with the first stage rod of the transmission assembly, a lower end of the outer tube is provided with a bottom plate, a lower end of the first stage casing of the telescopic transmission assembly abuts the bottom plate, and the second stage casing of the telescopic transmission assembly drives the middle tube to go up or down along the axial direction. a first stage rod, a second stage rod, a first stage casing, and a second stage casing, wherein the second stage rod is formed in a hollow structure having an inner surface and an opposite, outer surface and a through hole defined by the inner surface, the outer surface being provided with external threads, and the inner surface being devoid of threads; wherein the first stage rod is disposed in the through hole of the second stage rod and adapted to drive the second stage rod to rotate synchronously, such that the first stage rod and the second stage rod are telescopically expandable or contractible relative to each other along an axial direction; wherein the first stage casing is provided with a first transmission nut, the external threads of the second stage rod being in a screw-thread fit with the first transmission nut; and wherein the second stage casing sleeves over the first stage casing, the second stage casing being provided with a second transmission nut, the first stage rod being in a screw-thread fit with the second transmission nut, and the second stage rod being positioned with the first transmission nut in the axial direction in a rotatable manner, the lifting column further comprises an inner tube, a middle tube, an outer tube, a housing fixedly connected onto an upper end of the inner tube, and a driving device arranged in the housing, the telescopic transmission assembly is sheathed by the inner tube that is, in turn, sheathed by the middle tube that is, in turn, sheathed by the outer tube; and the driving device is adapted to drive the telescopic transmission assembly, wherein the driving device is mechanically coupled with the first stage rod of the transmission assembly, a lower end of the outer tube is provided with a bottom plate, a lower end of the first stage casing of the telescopic transmission assembly abuts the bottom plate, and the second stage casing of the telescopic transmission assembly drives the middle tube to go up or down along the axial direction.