The invention provides a lifting device for a cylinder type pile leg platform. The lifting device comprises multiple sets of gear systems, multiple sets of racks and lifting frames, the racks are welded to a cylinder type pile leg, the gear systems are connected with the corresponding racks through the lifting frames and distributed on the cylinder type pile leg, and therefore when the cylinder type pile leg platform is lifted or works or is towed, the gear systems can be meshed with the corresponding racks. The height of the lifting device is reduced, and it is guaranteed that gear loads are as uniform as possible. When the bearing capacity of gears has to be increased, the number of gear rows does not need to be substantially increased as the number of the gears is increased, and therefore uniformity of the bearing capacity of the gears is improved.