The invention discloses a buffer block used in an automobile shock absorber. The buffer block is prepared from the following components in parts by weight: 80-84 parts of #3 smoke sheet rubber, 6-8 parts of nitrile rubber buna, 2.2-2.4 parts of stearic acid, 0.4-0.6 part of accelerant M, 1.3-1.5 parts of accelerant TT, 25-30 parts of carbon black, 0.6-0.8 part of anti-aging agent D, 0.4-0.6 part of anti-aging agent 4010, 3-4 parts of zinc oxide, 0.5-0.7 part of paraffin, 1.4-1.6 parts of sulfur and 2.6-3 parts of pine tar. The #3 smoke sheet rubber used in the buffer block is resistant to fatigue and aging and is solid when being combined with metal, so that the #3 smoke sheet rubber is used as a main body material of the buffer block; due to adoption of the accelerants and the sulfur, the thermal resistance, the aging resistance, the impact resistance and the elasticity of the buffer block are improved, the comfort level of people when sitting on an automobile is improved, the tensile strength is 30-34MPa, the elongation rate is 600-620%, the shore type A hardness is 65-68 degrees, the permanent deformation is less than or equal to 15%, the rebound rate is 25-28%, and the service life is prolonged for 1.5-2.0 times.