Method for installing offshore floating body for wind power generation

A method for installing offshore wind power generation floating body, comprising:

• manufacturing a lower structure comprising a damping plate having a circular plate shape, a guide beam configured to support each of a top surface and a bottom surface of the damping plate and comprising a plurality of protruding portions formed on a side surface of the damping plate, and a slot for fixing an upper structure, which is formed in the top surface of the damping plate and has an empty space at a central portion thereof;
• coupling a temporary buoyancy tank to each of the plurality of protruding portions;
• installing a concrete block mounting structure in the empty space of the slot for fixing the upper structure;
• transporting the lower structure on the sea until a destination by a towing vessel;
• fixing the lower structure between a first work barge and a second work barge by a link bridge connected to each of the first work barge and the second work barge;
• and
• seating a concrete block connected to a second wire of a second crane seated on the second work barge on the concrete block mounting structure in a state in which a plurality of first wires of a first crane seated on the first work barge are connected to the lower structure to maintain a tension equal to or greater than a set magnitude.