The invention relates to a nested water tank capable of reducing vibration and dissipating energy. The nested water tank comprises a spring shock-absorbing seat. A water tank body is arranged on the spring shock-absorbing seat and comprises an outer-layer water tank. A middle-layer nested water tank is arranged in the outer-layer water tank, an inner-layer nested water tank is arranged in the middle-layer nested water tank, and a pressure relief opening is formed at the top end of the outer-layer water tank. The nested water tank capable of reducing vibration and dissipating energy has the advantages that fire demand water or domestic water can be stored on a roof or a mechanical floor of a general high-rise building or a super high-rise building by utilization of the nested water tank, structural vibration energy can be dissipated through dampening effect when an earthquake or strong breeze disaster occur, vibration amplitude of the water tank body and the building is reduced, and damage of the earthquake to the main body structure of the building and the water tank body is reduced. In addition, effect of vibration reduction and energy dissipation is good, efficacy loss cannot occur easily, application range is wide, applicability is strong, the structure is simple, manufacture and installation are convenient, an existing water tank can be transformed to be the nested water tank, cost is low, dual functions of the water tank are achieved, and practical applicability is strong.