Lifting device for columnar rod body

The invention discloses a lifting device for a columnar rod body, comprising: a climbing unit comprising a first clamping assembly and a second clamping assembly, the first clamping assembly and the second clamping assembly being capable of clamping the outer side wall of the columnar rod body; the connecting unit is connected to the first clamping assembly and the second clamping assembly and comprises a first connecting piece, a second connecting piece and a telescopic piece; the guardrail unit is arranged at the bottom of the connecting unit and comprises guardrail frames which are symmetrically arranged, connecting supporting plates arranged at the bottoms of the guardrail frames and connecting buckles connected to the upper ends of the guardrail frames; the climbing unit and the connecting unit are combined to form the climbing mechanism capable of ascending and descending on the columnar rod body, the two clamping assemblies form two feet moving alternately under the connecting and driving effects of th