The utility model provides an automobile trunk door anti-collision device for a vertical circulation stereo garage. An elastic buffer device is arranged at the position, corresponding to a trunk, of the lower surface of a hanging basket shaft of each parking space. The elastic buffer device is installed below the hanging basket shaft, when the automobile trunk door bounces, the elastic buffer device isolates the trunk door from the hanging basket shaft, the trunk door is prevented from directly touching the hanging basket shaft, the elastic buffer device absorbs kinetic energy generated when the trunk door bounces, the contact area between the elastic buffer device and the trunk door is large, and the trunk door can be effectively protected.