Sink-to-bottom type shellfish ecological remediation device

The invention discloses a sink-to-bottom type shellfish ecological remediation device. The sink-to-bottom type shellfish ecological remediation device comprises a tank without the lower wall and a hollow sealing plate and is characterized in that the lateral wall of the tank is prepared from a metal net, a hard pipe is fixed to one side of the sealing plate in a sealing manner, a piston plate is slidably connected into the pipe in a sealing manner, a fixing plate is fixed at one end, close to the sealing plate, of the piston plate, two limit rods are slidably connected to the fixing plate in apenetrating manner, the inner wall of one end, close to the sealing plate, of the pipe is provided with two limit grooves, and a magnetic block is rotatably connected to each of one ends, close to each other, of the two limit rods through a rotary rod. The sink-to-bottom type shellfish ecological remediation device has the advantages that a decomposable support plate can be slowly decomposed in seawater after the tank is