The invention discloses a double-tapered-angle magnetic liquid 
shock absorber on the basis of a first-order 
buoyancy principle, and belongs to the field of vibration of 
mechanical engineering. The problem that due to multiple structural problems, an existing magnetic liquid damping 
shock absorber cannot be applied to the 
engineering practice is successfully solved. The double-tapered-angle magnetic liquid 
shock absorber comprises a shell (1), a first permanent 
magnet (2), an upper end cover (3), magnetic liquid (4), a 
mass block (5), a second permanent 
magnet (6) and a lower end cover (7). When the exterior vibrates, the 
mass block (5) moves in a cavity, and the magnetic liquid (4) flows in a gap between the inner hole wall of the shell (1) and the 
mass block (5), so that the energy is absorbed, and the aim of reducing the vibration is achieved; first-order 
buoyancy formed by the first permanent 
magnet (2) and the second permanent magnet (6) in the magnetic liquid enables a 
frequency difference to be formed between the mass block (5) and the shell (1); and the vibration reduction efficiency is maximized.