Positive-pressure non-return well cementation device for geothermal well cementation

The utility model relates to the technical field of geothermal well cementation, in particular to a positive pressure non-return well cementation device for geothermal well cementation, which comprises a ground and a lifting device, an underground layer is arranged below the ground, a borehole is arranged in the underground layer, a lower casing pipe with the upper end connected with an upper casing pipe is arranged in the borehole, and two limiting blocks are mounted on the left side and the right side of the upper end of the upper casing pipe. A limiting ring is installed above the ground, the two limiting blocks are placed above the limiting ring, the bottom of the lifting device is connected with a drill rod through a lifting rope, the lower end of the drill rod extends to an inner cavity of the upper sleeve, a slurry pump and a slurry tank are installed on the ground, a first connecting pipe is connected between the slurry pump and the slurry tank, and the slurry pump is connected with a second connectin