The invention provides an offshore rock socketing operation platform. The offshore rock socketing operation platform comprises a self-elevating operation platform (1), wherein four lifting pile legs (1.1) are mounted at four corners of the self-elevating operation platform (1); a hole drilling device (2), comprising a door frame which is of an opening-closing structure, is mounted on a deck of the self-elevating operation platform (1); pressurizing oil cylinders (2.5) are arranged on the door frame; pressurizing slide blocks (2.6) are slidably arranged in the door frame; the pressurizing oil cylinders (2.5) can apply a downward pressure to the pressurizing slide blocks (2.6); drilling rods (2.7) are vertically downwards arranged on the pressurizing slide blocks (2.6); drill bits (2.8) are mounted at the bottom parts of the drilling rods (2.7). The offshore rock socketing operation platform is high in construction efficiency and good in construction effect.