The invention provides a semi-submersible living platform. The semi-submersible living platform comprises lower floating bodies, stand columns which are separately supported on the corresponding lower floating body, and a main hull supported on the stand columns, wherein each of the lower floating bodies is flat; the cross section of the main body of each lower floating body is rectangular, and a height-width ratio is 0.52 -0.62; and the width of a bow end and the width of a stern end of each of the lower floating bodies are separately, smoothly and gradually reduced in the direction of the corresponding end part. According to the semi-submersible living platform disclosed by the invention, each of the lower floating bodies adopts a flat type structure and has a small height-width ratio coefficient, so that the area where the wave energy is concentrated can be avoided, the natural period of the heave motion of the platform is prolonged, the movement performance of the platform, the air gap of the lower surface of the main hull and slamming on the lower surface of the main hull are improved, and the safety of the semi-submersible living platform is improved; besides, the bottom area of the lower floating bodies is relatively increased by the small-coefficient-height-width ratio structure of the lower floating bodies, so that the platform is conveniently towed in shallow water or is transported by a crane ship; and in addition, the streamlined structures of the bow ends and the stern ends of the lower floating bodies also contribute to reducing the flow resistance borne by the platform and the fuel consumption during navigation conditions is reduced, so that the cost is reduced.