The utility model relates to a viscous damping wall which comprises a square outer frame. Wherein the filler walls are arranged on the left side and the right side in the outer frame, the supporting wall is located between the filler walls, a mounting cavity transversely dividing the supporting wall into an upper part and a lower part is formed in the middle of the supporting wall, and an inner plate is arranged in the mounting cavity; a plurality of vertically-arranged upper embedded parts are further arranged in the upper portion of the supporting wall, and a plurality of vertically-arrangedlower embedded parts are further arranged in the lower portion of the supporting wall. A transversely-arranged viscous damper is arranged in the mounting cavity, the two ends of the viscous damper are connected with a first connecting piece and a second connecting piece correspondingly, the first connecting piece is connected with the upper embedded part through a rivet, and the second connectingpiece is connected with the lower embedded part through a rivet. An upper sliding groove and a lower sliding groove are formed in the upper portion and the lower portion of the outer side of the mounting cavity correspondingly and internally provided with sliding doors. The device is simple in structure, damping of the cavity can be achieved, meanwhile, the sliding door is arranged, and the interior can be conveniently overhauled.