The invention discloses a lifting mechanism having the longer service life. The lifting mechanism comprises a base, wherein a lifting column is mounted on the base and is formed by at least two casing pipes through sleeved connection; every two casing pipes in sleeved connection comprise an inner pipe and an outer pipe, a first sliding block and a second sliding block are arranged between the inner pipe and the outer pipe, the first sliding block is fixed at the bottom of the inner wall of the outer pipe and is in sliding fit with the inner pipe, the second sliding block is fixed at the top of the outer wall of the inner pipe and is in sliding fit with the outer pipe, both the first sliding block and the second sliding block adopt annular structures, first buckling parts are arranged in positions, facing the second sliding block, of one end of the first sliding block, an annular clamping groove for buckled connection of the first buckling parts is formed in the inner wall of the outer pipe, a second buckling group is arranged on the inner wall of the second sliding block, buckling holes for buckled connection of the second buckling group are formed in the outer wall of the inner pipe, a limiting annular groove is formed between the first sliding block and the second sliding block and in the inner pipe, and an elastic limiting ring is arranged in the limiting annular groove. The lifting mechanism is convenient to mount, and the service life of the lifting mechanism is prolonged.