The invention provides a damping vibration isolator for electric power facilities. The vibration isolator comprises a top plate, a middle plate and a bottom plate which are arranged in parallel in the horizontal direction coaxially. A support and a limit piece are arranged between every two adjacent plates. The vibration isolator is provided with a limit device in the vertical direction to limit the tensile displacement of the laminated supports, and the supports are prevented from being subjected to tensile failure due to the fact that the tensile distance exceeds the largest tensile limit, and accordingly the service life of the vibration isolator is prolonged.