The invention relates to the technical field of environment protection, in particular to a 
biology floating island capable of automatically rising and falling. The island comprises a 
floating island body, an inside-water stand column, a shoreside 
rope fixing 
pile, a 
pulley, a bidirectional motor, at least one fixing end steel 
wire rope, a shoreside stand column and at least one traction end steel 
wire rope. The 
floating island body is provided with a frame structure. One end of each fixing end steel 
wire rope is fixed to the top end of the inside-water stand column, and the other end of each fixing end steel wire 
rope is connected with the frame structure. One end of each traction end steel wire 
rope is connected with the frame structure, and the other end of each traction end steel wire rope is fixed to the fixing 
pile or connected with the bidirectional motor. The 
pulley is arranged at the top end of the shoreside stand column. The position of the 
biology floating island in a river channel 
water body is controlled by the bidirectional motor and the steel wire ropes; the bidirectional motor is used in the adjusting process of the 
biology floating island, labor is saved, and the island is convenient to operate and easy to obtain. In addition, the biology floating island is scientific in structural setting, stable in force bearing of each layer, and capable of normally working, rising and falling under the 
severe weather conditions.