Lift type double positioning modularized submerged plant water purifying device

The invention discloses a lift type double positioning modularized submerged plant water purifying device. The lift type double positioning modularized submerged plant water purifying device comprises multiple lift type double positioning modules respectively composed of mattress main bodies and buoyancy systems, wherein each buoyancy system comprises a frame type support, and foam sheets are bound on the frame type supports; each mattress main body comprises a mattress water level regulating frame which is internally provided with a communicating space inside and is composed of an upper rectangular frame, a lower rectangular frame, a latticed connecting pipe and a vertical connecting pipe, a foam supporting plate is fixedly arranged on each lower rectangular frame, multiple holes are formed in each foam supporting plate, and a plastic planting basin planted with submerged plants is embedded in each hole; and an adjustable connecting rope is arranged between each mattress main body and the corresponding buoyancy system. The lift type double positioning modularized submerged plant water purifying device can be used for adjusting positions of the submerged plants in water in a light compensation depth vertical space by virtue of irrigation and water pumping inside each mattress main body and the effect of each adjustable connecting rope, so as to realize change of an ecological niche of the submerged plants along water level, transparency and the like, and the lift type double positioning modularized submerged plant water purifying device has the advantages that multiple aquatic plants can be planted, varieties are rich and the survival rate is high.