The invention belongs to the technical field of shock absorbers, and particularly relates to a shock absorber provided with a friction force damper and used for a train. The shock absorber comprises first telescopic rods, a first supporting plate, a fixed plate, a second supporting plate, a third supporting plate, a fourth supporting plate, travelling wheels and a bottom plate; when the shock absorber is used, in the running process of the train, when the travelling wheels on the trains are in contact with a barrier in the rotating process, the travelling wheels bounce upwards; the travellingwheels bounce upwards so that a sliding supporting plate is driven to bounce upwards through a corresponding supporting shaft; the sliding supporting plate bounces upwards so that friction can happenbetween a first friction plate and a second friction plate; friction happens between a third friction plate and two corresponding friction blocks; and due to the friction, the speed at which a first installing block and a second installing block move upwards can be buffered; and that is, the bouncing of the travelling wheels is buffered through the friction.