Automobile rear coupler mounting structure

The invention provides an automobile rear coupler mounting structure which comprises a rear wall outer plate and a rear wall inner plate which are welded with each other, notches are formed in the lower portions of the rear wall outer plate and the rear wall inner plate, a threaded pipe penetrates through the notches and is fixedly connected with the rear wall inner plate through a mounting plate, and a pipe core of the threaded pipe is consistent with the length direction of an automobile. A reinforcing plate is arranged in a cavity defined by the rear wall outer plate and the rear wall inner plate right above the notch, the plate face of the reinforcing plate is located in the vertical plane and parallel to the length direction of the automobile, and the reinforcing plate is welded to the rear wall outer plate and the rear wall inner plate. When the threaded pipe is subjected to dragging force, the rear wall outer plate and the rear wall inner plate right above the notch are the positions bearing the maximu