The utility model relates to an engine crankshaft shock attenuation belt pulley connection structure solves and causes the the crankshaft cover to be dropped, produce easily the problem of damage by carring over out of when current engine crankshaft goes up the dismantlement of shock attenuation belt pulley easily. This device outwards overlaps in proper order and is equipped with timing sprocket, shock attenuation belt pulley, its characterized in that including bent axle, bent axle output pot head: shock attenuation belt pulley axis location is equipped with the cover and establishes at the epaxial axle sleeve of song, and shock attenuation belt pulley and axle sleeve are the integrated into one piece structure, and the axle sleeve is terminal surface salient in the medial surface of shock attenuation belt pulley inwards, and the terminal surface supports the lateral surface that depends on timing sprocket in the axle sleeve. The utility model discloses a shock attenuation belt pulley and the axle sleeve structure of a body structure have reduced the assembly step, and the the crankshaft cover that sets up when just avoiding dismantling, is alone easily taken out of the problem of breaking, and increased the matching length of shock attenuation belt pulley and bent axle, improved stability.