The invention provides a damping device used for electric equipment and an application method of the damping device. The damping device comprises a support table (20), a damping assembly (21) and the electric equipment (22) which are arranged sequentially from bottom to top. The damping assembly (21) is composed of a fixing frame (4), a flexible concrete column (6) and a cover plate (1). The flexible concrete column (6) is arranged in the fixing frame (4) and provided with a support piece (5) in the vertical direction of the flexible concrete column (6). The application method of the damping device comprises the steps that (1) flexible concrete is prepared; (2) the fixing frame is horizontally arranged on the support table; (3) the support piece is vertically arranged in the fixing, and the flexible concrete is poured to the equal height to the support piece; (4) a damper is horizontally arranged on the flexible concrete column and connected with the support piece; and (5) the high-pressure electric equipment is fixed on the damper. According to the damping device, the double damping control structures of the damper and the flexible concrete are used, so that the damping device has the characteristics of being high in damping capacity and convenient to construct.