Leakage-free fluid damper

The invention relates to a leakage-free fluid damper, which comprises a disc, a bottom disc flange which is arranged opposite to the disc, a hydraulic cylinder for making the circular disc and the bottom circular disc flange in leakage-free connection, a disc flange provided with a fifth aperture, and a cylinder with disc flanges at two open ends, wherein the upper end of the cylinder with the disc flanges at the two ends is provided with an upper end disc flange; and the lower end of the cylinder with the disc flange at the two ends is provided with a lower end disc flange. A piston in the damper is dragged to move by magnetic force; when the piston moves, the damping fluid flows through a small round through hole on the piston; and the energy is consumed when the damping fluid flows through the small round through hole on the piston, and an effect of controlling vibration is achieved. Therefore, a sealing piece is not used, and the damping fluid hardly leaks from the damper.