Lower back door electric driving structure and automobile

The utility model discloses an electric driving structure of a lower back door, which comprises a mounting frame used for being fixedly connected to the lower back door of an automobile; the driving motor is arranged on the mounting frame; the speed reducer is arranged on the mounting frame, and the input end of the speed reducer is connected with an output shaft of the driving motor; one end of the swing arm is connected to the output end of the speed reduction device; one end of the connecting rod is rotationally connected to the other end of the swing arm through a first ball pair, and the other end of the connecting rod is rotationally connected to the automobile body through a second ball pair; the driving motor drives the swing arm to rotate after passing through the speed reducer, and when the swing arm rotates away from the connecting rod, the swing arm pulls the lower back door to rotate to a closed position relative to the automobile body through the connecting rod; when the swing arm rotates toward