Three-stand-column semi-submersible type offshore floating platform

The invention discloses a three-stand-column semi-submersible type offshore floating platform. The three-stand-column semi-submersible type offshore floating platform comprises an upper box type component and a lower box type component. The upper box-type component comprises two inclined components and a transverse component, one ends of the two inclined components are connected, and the two ends of the transverse component are connected to the two inclined components respectively; an A-shaped structure is defined by the oblique components and the transverse components. The structural center of the upper box-type component is located on the transverse component. The lower box-type component is of a ring-type structure with a hollow middle part; three stand columns are arranged between the upper box-type component and the lower box-type component; the top of one stand column is located at the joint of one ends of the two inclined components, and the tops of the other two stand columns are located at the other