The invention discloses an automobile-shock-absorber failure detection and alarm system. The automobile-shock-absorber failure detection and alarm system comprises a main shock absorber located on an automobile suspension system, a spare shock absorber located on the automobile suspension system, a movement sensing module, a distance recording module, a temperature detecting module, an alarm module and a control module. The movement sensing module is used for sensing whether an automobile moves or not and transmitting movement signals to the distance recording module when the automobile moves; when receiving the movement signals, the distance recording module automatically performs zero clearing and starts recording; when the distance value continuously recorded by the distance recording module is larger than a distance threshold value, the distance recording module transmits starting signals to the control module; after the control module receives the starting signals, the temperature detecting module is started to detect the temperature of a shell of the main shock absorber; when the temperature detected through the temperature detecting module is lower than a preset temperature threshold value, the control module stops the main shock absorber; meanwhile, the spare shock absorber is started, and starting signals are transmitted to the alarm module to inform an automobile owner in time.