The invention discloses a supersized wellhead platform, which comprises an upper module, a jacket and a plurality of steel pile foundations, wherein the upper end part of the jacket is connected with the upper module; the steel pile foundations penetrate through pile legs of the jacket; the upper module comprises an upper-layer deck, a lower-layer deck and a working deck, which are sequentially arranged from top to bottom; two well slot areas are arranged at an interval on the upper-layer deck. The wellhead platform also comprises a drilling module, an oil production module and an oil and gas metering module. According to the wellhead platform, large-sized oilfields with water depths of 10 to 40m and more than 50 well slots can be efficiently and rapidly developed with low construction investment cost by one wellhead platform; the project investment is greatly saved under the condition of ensuring the construction progress and safety, the well drilling and completion progress is accelerated to put the oilfield into operation as soon as possible, and the project benefits are remarkably improved; the wellhead platform has broad application prospect in the development of such oilfields.