Overwater deep-buried type bearing platform drilling pile construction device

The utility model relates to the field of building construction, aims to solve the problems of inconvenience in underwater construction and large required length of a steel casing of an existing drilled pile, and provides an overwater deeply-buried bearing platform drilled pile construction device which comprises a plurality of steel pipe piles, and the lower ends of the steel pipe piles are fixedbelow a mud surface of a construction point. The platform lower plate is horizontally arranged and is supported on the plurality of steel pipe piles; the platform lower plate is provided with a vertical port used as a lower port of the steel casing; the two bailey frames are supported on the platform lower plate at an interval and are respectively positioned on two sides of the vertical through hole; the two platform plates are respectively connected to the two bailey frames, and the upper surfaces of the platform plates are set to be platform top elevations; the steel casing vertically penetrates through the vertica