Water stop structure used between bottom panel and lining of underwater tent cofferdam

The utility model discloses a water stop structure used between a bottom panel and a lining of an underwater tent cofferdam. Wherein the outer waterstop is arranged on the side, close to channel waterflow, between a base plate and a slope/canal bottom lining joint face which are arranged on the three circumferences of the bottom face of a cofferdam steel truss at intervals, and the inner waterstop is arranged on the side close to a cofferdam working area. Wherein the outer waterstop is made of a waterstop material with an omega-shaped cross section, the inner waterstop is a rubber air bag with a circular cross section, a seepage water collecting channel is formed between the outer waterstop and the inner waterstop, and an overflow hole is formed in the base plate positioned at the top ofthe seepage water collecting channel at the bottom of the canal. The inner water stop and the outer water stop are arranged between the base plate and the lining, the seepage water collecting channelis formed between the two w