The invention discloses water area screw anchor construction equipment which comprises a screw anchor part, a floating platform, an anchor lowering machine body and a hydraulic power station. The screw anchor part is composed of a screw anchor rod with an anchor tray, multiple connecting rods and a gravity block, directly contacts with a soil body and interacts with the same, and anti-drawing requirements of the anchor rod are met; the floating platform is composed of a floating body formed by splicing engineering plastic buoys, a bearing steel frame formed by splicing multiple steel structure modules, a supporting frame and an inserting rod and used for fixing the anchor lowering machine body and providing buoyancy needed by the whole. A modularization design concept is utilized, and the floating platform which is splicable is adopted to replace a ship or a special pontoon, so that convenience is brought to transition construction and site mounting; measures like using a high-strength steel material, reasonably arranging size and position of the screw anchor tray and adopting a combined anchoring mode combined with the gravity anchor are adopted, so that anti-drawing performance of a screw anchor is improved and the water area screw anchor construction equipment is enabled to meet anchor lowering construction needs in an overwater operating environment.