Piling wall type foundation pit supporting and water stopping integrated structure and construction method thereof

The invention particularly discloses a piling wall type foundation pit supporting and water stopping integrated structure and a construction method thereof. The piling wall type foundation pit supporting and water stopping integrated structure comprises a joint type steel bar round cage, a standard B type steel bar round cage and a standard A type steel bar round cage. The construction method comprises the following steps of leveling a construction site, measuring and positioning a guide wall, excavating a groove to the designed depth, removing sludge and residues at the bottom of the groove, manufacturing, lowering and fixing the standard steel bar round cages and the joint type steel bar round cage, and finally, lowering and installing a guide pipe, so that underwater concrete pouring is completed. The joint type steel bar round cage, the standard A type steel bar round cage and the standard B type steel bar round cage are light in weight, the steel bar round cages can be rapidly lowered and positioned, the