Low-speed half direct-driven marine current energy power generation device

The invention belongs to the field of new energy power generation, and in particular relates to a low-speed half direct-driven marine current energy power generation device. The power generation device comprises an impeller, a hub, a cabin, a variable propeller pitch mechanism and a generator; a rotor of the generator is fixed on an upright post at the bottom in the cabin; and the axial directionof the rotor of the generator is vertical to the axial direction of a main shaft of the impeller. The main shaft of the impeller is in transmission with the rotor of the generator by adopting a pair of conical gears. The main shaft is provided with a through hole in the axis direction, a driving mechanism of the variable propeller pitch mechanism is positioned in the cabin, a driving rod of the driving mechanism passes through the through hole of the main shaft and enters the hub, and the driving rod is connected with an execution mechanism of the variable propeller pitch mechanism positionedin the hub. By adopting th