The invention relates to a production method of a car shock absorption airbag. An airbag mold is designed into a segmental mold structure. In the mold closing process, a vulcanizing machine drives a middle mold sleeve to apply external force to segmental blocks to contract along the conical surface of the mold, and springs are pressed to store energy. In the mold opening process, the vulcanizing machine lifts up an upper cover and the middle mold sleeve, the springs release the energy stored in the mold closing process to enable the segmental blocks to actively open along the conical surface of the middle mold sleeve to reach the set mold opening distance, the segmental blocks stop opening, a center mechanism pushes the airbag out, the middle mold sleeve and an upper side plate are drivenby the vulcanizing machine to continue rising upwards in the vertical direction to reach the safety height, and then the airbag is taken out. Through the production method, a segmental block mold formis adopted to replace an original two half-mold working form airbag to form the mold, and the working efficiency is improved. manual intervention can be reduced, and the production method provides aport for achievement of automatic production.