The invention discloses a movable floating breakwater with an oscillation water column type wave energy conversion device, and belongs to the field of ocean energy utilization. The movable floating breakwater consists of multiple floating breakwater modules; and the modules are elastically connected to realize independent movement and of each module and power generation, and can form a floating breakwater power generation pasture. Single floating breakwater module comprises a square box, a power generation device, a connecting device and a mooring system. The multiple modules are elastically connected through connecting devices. The movement of a floating body is caused by a wave motion to cause movement of a fluid in a power generation cabin, so that the air pressure at the upper part ofthe cabin is continuously changed; the air pressures on the two sides of a turbine are different to form reciprocating air currents; kinetic energy of gas is converted to mechanical energy through anair turbine; and the mechanical energy is converted to electric energy through a generator. The floating breakwater and a wave energy power generation device are fused to realize covering of offshoreocean structures and to generate the electric energy to achieve the advantages of capability of moving and repeating, no limitation from the water depth and the geology and the like; and the movable floating breakwater is simple in structure, easy to produce and maintain, free of pollution to the marine environment and broad in application prospect.