Amplitude-dependent damper

The invention relates to an amplitude-dependent damper. The damper comprises an upper end cover, a framework oil seal, a guider, an inner cylinder barrel, an outer cylinder barrel, a piston assembly, a bottom valve assembly and a lifting lug, and is characterized by further comprising a piston rod, an intermediate cavity upper end cover connected with the piston rod through threads, a one-way valve assembly assembled between the piston rod and the intermediate cavity upper end cover and composed of a spring and a small ball, an intermediate cavity outer barrel connected with the intermediate cavity upper end cover and an intermediate cavity lower end cover connected with the intermediate cavity outer barrel. An upper conical spring, a floating piston and a lower conical spring are arranged in an intermediate cavity, and the upper conical spring and the lower conical spring are connected with the intermediate cavity upper end cover and the intermediate cavity lower end cover respectively. The piston assembly is fixed to the intermediate cavity lower end cover through a fastening nut. The damper can recognize different running conditions of a vehicle and adjust the damping characteristics according to the different running conditions of the vehicle, so that high riding comfort, high steering stability and high running safety are guaranteed.