Pipe jacking construction hole water stop device

The utility model discloses a water stopping device for a pipe jacking construction hole. The water stopping device comprises a water stopping ring, a rubber ring, a tightening hoop and an adjusting device. The rubber ring is sleeved outside the jacking pipe, and one end of an outer ring of the rubber ring is hermetically fixed with an inner ring of the water stop ring; the outer ring is tightly wound on the rubber ring; the adjusting device comprises a shell and a ratchet wheel mechanism installed in the shell, the ratchet wheel mechanism comprises a ratchet wheel and a pawl, one end of the pawl is rotationally connected with the shell and is parallel to the axis of the ratchet wheel, the other end of the pawl is located in a tooth groove of the ratchet wheel, two receding channels are formed in the positions, on the two opposite sides of the ratchet wheel, in the shell, and racks are fixed to the two ends of the tightening ring. The two racks are inserted into the two receding channels respectively and mesh