The invention relates to a damper sealing device comprising a guiding seat with a wedge-shaped inner hole. The damper sealing device comprises a piston rod, the guiding seat, an oil collection groove, a low-pressure oil seal, a high-pressure oil seal, a dust ring, a hole sealing ring, a limiting seat, an oil leakage sensor, a gasket, a rubber material and an oil discharging channel, wherein the guiding seat is provided with the wedge-shaped inner hole, and the wedge-shaped inner hole is filled with oil liquid in an extension stroke of a damper, and extends towards the piston rod and clings to the wall of the piston rod, so that oil liquid adhering to the piston rod is reduced; the wedge-shaped inner hole shrinks in a compression stroke of the damper, so that the distance from the wedge-shaped inner hole to the wall of the piston rod is increased, and the backflow of oil liquid to an upper cavity of a piston is accelerated; the oil leakage sensor is mounted in a damper cylinder and is tightly matched with the upper part of the piston rod so as to monitor lost working oil; and the low-pressure oil seal is tightly matched with the high-pressure oil seal so as to further seal the oil liquid. The damper sealing device has the advantages that by utilizing multiple leak-proof devices, the damper can be sealed well; and by utilizing the oil leakage sensor, the damper achieves an oil leakage pre-warning function.