The invention provides a damping device. The damping device comprises an upper connecting plate, a lower connecting plate and a damping assembly, wherein the upper connecting plate and the lower connecting plate are horizontally arranged; the damping assembly is vertically arranged between the upper connecting plate and the lower connecting plate; a concave-convex matching contact surface which can freely rotate is arranged between the upper connecting plate and the lower connecting plate; and the damping assembly is arranged at the outer side of a concave-convex part between the upper plate and the lower plate. The damping device has the advantages of being convenient to manufacture and mounting, clear in damping mechanism, and free from influence on electrical function after being mounted; the safety and the stability of electronic equipment under earthquake effect; the device is flexible in mounting position, and is applicable to supporting column type electrical equipment of a transformer substation or a convertor station and equipment such as a smoothing reactor and a capacitor set.