Energy storage device

An energy storage device is characterized in that an energy storage base is built by using building materials, four tanks are arranged in the base, an integral heavy weight bottom plate is arranged on the four tanks, and a heavy weight with a certain weight is arranged on the heavy weight bottom plate; a bottom plate support is arranged in the tank barrel, and the bottom plate support can vertically lift in the tank barrel; a liquid bag is arranged at the bottom in the tank barrel, a liquid inlet/outlet is formed in the bottoms of the bag and the tank barrel, a liquid pump is arranged between the reservoir and an inlet of the tank barrel, and a water turbine is arranged between the reservoir and an outlet of the tank barrel; liquid is injected into the bag through pressure of the liquid pump, the heavy weight is jacked up through the bottom plate support and the heavy weight bottom plate under the swelling action of the bag, energy is stored, when power generation is needed, the liquid with certain pressure i