The invention discloses an ocean wind energy converting device, and belongs to the technical field of new energy sources. The ocean wind energy converting device comprises a tower barrel, vanes, a generator, a storage battery, and a transformer, wherein the vanes are connected with the generator, the transformer is fixed inside the tower barrel, the bottom of the transformer is connected with channel steel, and a buffer device is laid between the bottom of the transformer and the channel steel. According to the ocean wind energy converting device, the bottom of the transformer is connected with the channel steel and the buffer device is laid between the bottom of the transformer and the channel steel, so that natural frequency of the whole transformer is effectively changed, and the possibility that resonance occurs between the transformer and the tower barrel is avoided.