Double-pile-casing structure for underwater pile foundation construction

The utility model discloses a double pile casing structure for underwater pile foundation construction, which comprises an inner pile casing and outer pile casings sleeved outside the inner pile casing, the outer pile casings comprise an upper outer pile casing and a lower outer pile casing which are in butt joint with each other, hollow grooves are arranged inside the outer pile casings, second water pumping holes are arranged on the upper side and the lower side of the outer pile casing, and the second water pumping holes are communicated with the hollow grooves. The utility model has the beneficial effects that in the working process of the device, the outer pile casings isolate underground water, and the butt joint rings can facilitate the butt joint between the outer pile casings, so that the isolated water can be conveniently pumped out, the inner parts of the outer pile casings can be emptied, cement is convenient to pour, and the construction efficiency is improved. The inner pile casings can wrap the