Ocean floating type drilling platform crown-block heave compensator

The invention relates to an ocean floating type drilling platform crown-block heave compensator which comprises an upper bracket and a lower bracket, wherein the upper bracket and the lower bracket are fixedly connected to the upper part and the lower part of an crown block frame respectively; the top of the upper bracket is fixedly connected with a connecting frame; two pairs of guide rails are vertically arranged between the connecting frame and the crown block frame in parallel; a floating pulley assembly which can move up and down along the guide rails is arranged on the guide rails; the lower end of the floating pulley assembly is connected with a hydraulic cylinder assembly; the hydraulic cylinder assembly is connected with a power and control system; a fast line rocking arm assembly, a fast line guide device, a dead line rocking arm device and a dead line guide device are respectively arranged on the crown block frame; the fast line guide device and the dead line guide device are respectively connected