Steel sleeve plugging structure of deep foundation pit confined water dewatering well

The utility model discloses a deep foundation pit confined water precipitation well steel casing pipe plugging structure, which comprises a concrete bottom plate, a steel bar base, an overflow pipe, a valve and a precipitation well, the precipitation well is vertically arranged below the concrete bottom plate, a steel casing pipe is vertically arranged above the precipitation well, the outer wall of the steel casing pipe is provided with an outer water stop ring which is fixedly connected, and the outer water stop ring is fixedly connected with the steel casing pipe. The inner wall of the steel sleeve is provided with an inner water stop ring fixedly connected with the steel sleeve, the outer water stop ring corresponds to the inner water stop ring in position, the upper surface of the inner water stop ring is provided with a flange cover, the inner water stop ring is connected with the flange cover through a connecting bolt, a rubber gasket is arranged between the inner water stop ring and the flange cover,