Plug pin lifting mechanism for self-elevating platform

The invention discloses a plug pin lifting mechanism for a self-elevating platform and belongs to the field of marine engineering equipment. The plug pin lifting mechanism comprises a pile fixing frame, an upper ring beam, a lower ring beam, at least two upper lifting oil cylinders and at least two lower lifting oil cylinders, wherein the pile fixing frame is fixedly mounted on a platform main body of the self-elevating platform; a pile leg of the self-elevating platform penetrates the pile fixing frame and is movably inserted in the self-elevating platform; the upper ring beam and the lower ring beam movably sleeve the pile leg respectively; a plug pin component for limiting the axial movement of the upper ring beam along the pile leg is arranged on the upper ring beam; a plug pin component for limiting the axial movement of the lower ring beam along the pile leg is arranged on the lower ring beam; one end of each upper lifting oil cylinder is fixedly mounted at the top of the pile fixing frame; the other en