The present invention discloses a hydraulic internal aligner, which relates to the technical field of mountain pipeline construction equipment, including an aligning frame and a driving bracket, an aligning
assembly is arranged on the aligning frame, a driving
assembly is arranged on the driving bracket, an elastic connection
assembly is arranged between the aligning frame and the driving bracket, the driving assembly includes a driving wheel that can be flipped and pressed against the inner wall of the pipeline and a first
hydraulic motor whose output end is fixedly connected to the driving wheel; the elastic connection assembly includes a universal
ball joint fixed between the aligning frame and the middle part of the driving bracket, a plurality of
abutment rods are slidably arranged on the aligning frame, a sliding seat that is slidably matched with the driving bracket is hinged on the
abutment rod, and a first elastic member is fixedly connected between the
abutment rod and the aligning frame. The present invention provides a hydraulic internal aligner that can reliably adapt to various types of pipelines and realizes the split bending of the aligning frame and the driving bracket through the flippable universal
ball joint and the elastically arranged abutment rod and the sliding seat, thereby improving the bending ability.