The present invention relates to a wealth erosion cage farms that form the abalone, sea cucumber, scallops, fish (rockfish, sea bream, flounder, etc.) installed to lock the cage body in the water in the open sea ( ) , by using a structure of a PE pipe forms a cage sit sink body as selectively injecting air or sea water in the pipe, or a will to come up to the surface. to this end, a plurality of anchors (52) and the float ( 53) is fixed to the support bar 54 is made of a mooring rope 51, a pipe 55 for holding the grid in the form of a pipe inside the compartment into a plurality of area portion 57, each space portion 57 of or to the inlet of sea water into the interior, and the cage main body (59) having a flow path (58) to discharge, and connecting ropes (60) for enabling the said cage main body (59) every month in the mooring ropes 51, each of the space portion and one end is installed on the outer surface of the pipe 55, corresponding to 57, the other end of the pipe (55 through air injection means and air discharge means which is installed on the float 62 floating on the water surface and, the air injection means ), but the configuration with a compressor (63) for injecting air to the space portion 57, the air injection means and air discharge means is to be located on the outer surface of the separate space portion 57 fixed to the pipe 55, a plurality of first and second balance weights valves 64 and 65, and the first and second balance weights valve 64 manifold 67, which air hose (66a), (66b) is connected to the connection (65), the manifold (67 ), another air hose (68a), (68b), the air injection coupler are connected is installed on the float 62 floating on the water surface by 69 and consists of an air exhaust coupler (70), said first balance weight valve to the other end of the 64 is fixed to the pipe 55 are installed to enable forward and backward to the air inlet (72a) formed on the first housing 72 having an air inlet (72a), the first housing 72, an air
