The invention discloses a detachable ice-breaking damping device used for an ocean platform. The detachable ice-breaking damping device used for the ocean platform comprises an upper cone frustum barrel and a lower cone frustum barrel. The upper cone frustum barrel and the lower cone frustum barrel are both used for being arranged on a jacket leg of the ocean platform in a sleeved mode from top to bottom, the large-diameter end of the upper cone frustum barrel and the large-diameter end of the lower cone frustum barrel are arranged on the same horizontal plane, and the diameter of the large-diameter end of the upper cone frustum barrel is equal to that of the large-diameter end of the lower cone frustum barrel. The detachable ice-breaking damping device is not hard to build and install, convenient to detach, and capable of being reused or used for solving the problem of overhigh ice loads by being installed on an old platform, effective damping can be achieved, the damping device can be widely applied to ice-breaking structures of ocean platforms, particularly to platforms seriously affected by ice loads.