Offshore power generation device

The utility model relates to the technical field of offshore power generation, and discloses an offshore power generation device which comprises a controller, a water flow direction sensor, a vertically-arranged barrel body and a fixing seat arranged at the lower end of the barrel body and used for connecting the barrel body to the seabed. A first fixing rod extending outwards in the radial direction of the barrel is arranged at the lower end of the first gear and connected with a first water flow power generation device. The outer side of the barrel is connected with a first motor, the first motor is arranged above the first gear, an output shaft of the first motor is in transmission connection with a second gear, and the second gear is meshed with the first gear; the water flow direction sensor and the first motor are electrically connected with the controller; when a first impeller of the second water flow power generation device deviates from the seawater flowing direction, a first motor drives a first ge