Adjustable floating body, floating system and water surface photovoltaic power station

The adjustable floating body comprises a body, and a first connecting structure and a second connecting structure are arranged at the first end and the second end of the body respectively. The first connecting structure and the second connecting structure are each provided with an installation part, and the installation parts are used for being fixedly connected with the connecting structures of the adjacent floating bodies. At least one of the first connecting structure and the second connecting structure is provided with a plurality of mounting parts which are arranged one by one in the direction away from the body. At least one of the connecting structures at the two opposite ends in the body of the adjustable floating body is provided with the multiple mounting parts, the gaps between the adjustable floating body and the adjacent floating bodies can be adjusted by fixedly connecting the different mounting parts with the connecting structures of the adjacent floating bodies, and then the overall size of th