PROBLEM TO BE SOLVED: To effectively reduce pollutants and effectively carry sediment as a part of the organism body outside the system, thereby repairing a matter cycle system, cleaning the sea, and preserving the sea area environment.
SOLUTION: In sea area environment cleaning equipment by marine organisms, a pair of vertical walls 3 arranged apart from each other, or an offshore structure 2 and the vertical wall 3 are mounted on a foundation 1 disposed on the sea bottom. An organism's habitat 6 is installed between the air of the vertical walls 3 or between the offshore structure 2 and the vertical wall 3. The height of either or both of the vertical walls is set between the water surface level at high tide and the water surface level at low tide. At high tide, the upper end of the vertical wall 3 in the sea area environment cleaning equipment becomes below the sea surface, and sea water flows over the vertical wall 3 to flow into the organism's habitat 6. At low tide, the vertical wall 3 protrudes upward from the sea surface to insulate the organism's habitat 6 from the outside.