The invention discloses a linear buffer damper, comprising a damping spring and a damper component, wherein the damper component comprises a damping barrel and a piston component; the damping spring is a variable pitch spring. According to the linear buffer damper disclosed by the invention, the damping spring is a variable pitch spring, is capable of automatically adjusting the key performance parameter, namely the spring force according to the requirements of operating environments such as different road conditions, and combining with the parameters such as damping force when being used, and has the effect of dynamic application at any time, so that the comfort and the reliability of a finished automobile are effectively improved; the adaptability of the finished automobile on different road conditions is improved.