The invention relates to a floating ocean wave power plant, which includes floating cylinders floating in the sea, and a holder with enough length floating in the sea. A long shaft and a generator are arranged on the holder, chain wheel devices are arranged on the long shaft, and the holder is anchored by an anchor. The floating cylinders include static floating cylinders and dynamic floating cylinders, and the static floating cylinders and the dynamic floating cylinders are arranged alternatedly in intervals, the static floating cylinders are firmly connected with the holder, vertical poles are arranged on the upside of the dynamic floating cylinders, chains are arranged on the vertical poles, and the chains are meshed with chain wheel devices on short shafts. All short shafts are connected into a long enough shaft through couplings, and the long shaft is connected with the generator through a transmission. The chain wheel devices are provided with ratchets, and the dynamic floating cylinders drive the chain wheels and the long shaft to rotate to enable the generator generating electricity when moving upwards along with the ocean waves fluctuating, therefore the floating ocean wave power plant which can enable the generator to generate the electricity continuously and stably is formed.