Water pressure power-generating system

A water pressure power-generating system, comprising:

• a hydroelectric generator, a rotatable feeder, and at least two drain units all provided underwater, the drain units being disposed around the hydroelectric generator;
• the hydroelectric generator comprising a water inlet and a water outlet;
• each drain unit comprising a water catchment and a compression cylinder, the distance between the catchment and water surface being less than the distance between the compression cylinder and the water surface;
• the water catchment being provided with a first drainage outlet and a first drain valve at a bottom portion thereof, each water catchment being further provided with an air inlet having an air inlet valve and an air exhaust outlet having an exhaust valve, the air exhaust outlet being disposed at a top portion of the water catchment, each water catchment being further provided with a water inlet pipe for connection with the rotatable feeder, the water inlet pipe being provided with a first water inlet valve;
• the compression cylinder comprising a housing and balloons provided inside the housing, the housing being provided with a water inlet and a second water inlet valve, the balloons being connected with the air exhaust outlet and the air inlet of each water catchment respectively through first and second pipelines;
• the water pressure power-generating system further comprising a gas compressor, the gas compressor being connected with the compression cylinder through a third pipeline;
• and
• the rotatable feeder being provided with a first connection port for connection with the water outlet of the hydroelectric generator, and a second connection port for connection with the water inlet pipe of the water catchment, the first connection port being connected with the second connection port.