Floating type offshore wind power generation plant

The present invention comprises: an upper structure formed to be mounted by a wind power generation part; a lower structure formed of a buoyant material and supporting the upper structure; a mooring line which connects the lower structure and a sea bed to moor the lower structure; and column structures connected to each other and installed, respectively, along outer edges of the upper structure and the lower structure, the column structures being formed such that the connections are at an incline.