Pipeline external aligning device with rolling positioning function

The invention relates to a pipeline external aligning device with rolling positioning, which comprises at least one external enclasping ring for positioning and fixing an old pipe, at least one external fixing component is arranged on the external enclasping ring, and a plurality of external rolling positioning components are arranged in the circumferential direction of the external enclasping ring at intervals; the inner enclasping ring is arranged corresponding to the outer enclasping ring and used for positioning and fixing a new pipe, the outer enclasping ring and the inner enclasping ring are coaxially and oppositely arranged, and a plurality of inner rolling positioning assemblies are arranged in the circumferential direction of the inner enclasping ring at intervals. According to the device, the outer enclasping ring and the inner enclasping ring are arranged, before a new pipe is welded to an old pipe, the new pipe can be rotated, assembling and positioning of the new pipe and the old pipe are facilit