NOVELTY - The device has a ballast tank (40) supporting a wave-powered generator. The generator sinks when buoyancy of the tank is reduced in rough sea. The generator floats by increasing buoyancy of the tank by a unit when sea surface is calm. Air is vented via an air valve (50) allowing water to enter through a water valve (70) causing the device to sink below the surface in storm conditions. Submerged depth is controlled by admitting compressed air from a compressed air tank (80) via an intermediate air valve (130). A float (100) of the generator is folded into a protection position in high waves.    USE - Wave-powered generator protection device for a wave powered-generator such as service ship or a shore-based power supply.    ADVANTAGE - The device protects the wave-powered generator and prevents the wave-powered generator from being damaged by rough seas. The device enables buoyancy of the ballast tank to be constantly or intermittently adjusted by a buoyancy control system, so that an energy conversion mechanism can be at the right height to efficiently receive waves. The device allows a battery to operate when the wave-powered generator is submerged. The device enables roof of the wave energy generator to support and reinforce strength of a folded paddle in the self-protecting position. The device allows a sealed compartment of the float to be buoyant and contribute to an unfolded paddle rocking with the waves, thus contributing to harvesting of wave energy. The device allows a perforated hollow compartment to maintain the paddle in the self-protecting folded position. The device allows a massive item to be located near the bottom of the ballast tank so as to stabilize the ballast tank in an upright position and prevent the wave energy generator from excessive bobbing on the waves. The device enables an articulated joint to allow a paddle to fold into a self-protecting position when the waves are excessively large. The ring-shaped ballast tank provides a stable platform.    DETAILED DESCRIPTION - The shape of the ballast tank is a ring tube, a truncated cone or a straight cylinder. The unit is a mechanical linkage or ratchet. An INDEPENDENT CLAIM is also included for a wave-powered energy generator protection method.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a wave powered generator in a trough of a wave.    Ballast tank (40)    Ballast tank air valve (50)    Water valve (70)    Compressed air tank (80)    Float (100)    Intermediate air valve (130)