The invention provides a semisubmersible supporting platform. The semisubmersible supporting platform comprises a lower floating body, stand columns supported on the lower floating body, and a deck box supported by the stand columns, wherein an utility area module is arranged on the deck box, and is supported above a main deck of the deck box through supports; and a height interval is formed between the bottom of the utility area module and the main deck of the deck box. According to the semisubmersible supporting platform disclosed by the invention, the whole main deck of the semisubmersible supporting platform can be used for storing goods, so that the effective goods storing area of the deck is increased; the supporting capacity of the platform is high, so that the supply cycle of a supply ship can be reduced, and the cost is reduced; and a connecting manner of the utility area module and the deck box adopts support connection, so that the load effect of the deforming of the deck box to the utility area module is directly released, the stress condition of the utility area module is changed, especially, the fatigue strength performance of a joint structure of the utility area and the deck box is improved, and the reliability of the structure is improved.