The invention discloses a water construction device. The water construction device comprises a hammering base. The bottom face of the hammering base is internally provided with a caulking groove, andthe caulking groove is internally connected with a hammering plate in a sliding and conveying fit manner. The position, above the caulking groove, inside the hammering base is provided with a first sliding and conveying cavity. The first sliding and conveying cavity is internally connected with a first sliding and conveying block in a sliding and conveying fit manner. The first sliding and conveying block is internally provided with a fourth sliding and conveying groove in a leftward-rightward through manner. The inner wall of the left side of the first sliding and conveying cavity is internally provided with a driving guide cavity in a communication manner, wherein the driving guide cavity extends towards the left side and is internally connected with a first rotating rod in a rotation fit manner, the first rotating rod extends leftwards and rightwards, the left extended tail of the first rotating rod is connected with a first motor in a coordination manner, the outer surface of the first motor is arranged on the inner wall of the left side of the driving guide cavity and is fixedly connected with the inner wall of the left side of the driving guide cavity in a coordination manner, the right extended part of the first rotating rod extends into the fourth sliding and conveying groove, the right extended tail of the first rotating rod is connected with the inner wall of the right side of the first sliding and conveying cavity in a rotation fit manner, and the outer surface of the part, in the fourth sliding and conveying groove, of the first rotating rod is fixedly providedwith a first T-shaped wheel. According to the water construction device, the hammering work is automatically controlled, a pile body is effectively sunk to a designed elevation, and meanwhile, the stability during moving or transportation is improved.