A submarine power-generating frame is a device belonging to the technical field of seawater hydroelectric installation, which consists of vertical legs, lower longitudinal coupling beams, upper longitudinal coupling beams, a lower bridge plate, bridge legs, an upper bridge plate and lower horizontal coupling beams; the submarine power-generating frame is a vertical column frame which uses four vertical column legs as the main part, a bridge which is arranged in the middle part is supported by the vertical column frame, and the central hole in the middle of the bridge is installed with stationary shaft of a seawater hydraulic impeller rotary vertical transmission generating set or vertical shaft of a seawater hydraulic impeller rotary horizontal shaft transmission generating set, because the force of gravity of the device is located at the centre-of-gravity position of the submarine power-generating frame, when mobilization force of the seawater in the horizontal direction is acted on the device, the device does not topple over, the device stands on the bottom of the sea stably forever and keeps durability of the generating set.