Automobile rear floor structure and automobile

The utility model relates to an automobile rear floor structure and an automobile. The automobile rear floor comprises a rear floor body and is characterized in that a cross-shaped concave rib is arranged beside an oil tank opening in the rear floor body, an inclined rib groove and a vertical rib are further arranged on the floor body between the oil tank opening and the cross-shaped concave rib,and vertical ribs are further arranged on the floor body on the outer sides of the oil tank opening and the cross-shaped concave rib respectively; a cross-shaped boss is arranged in the middle of thebottom surface of the spare tire pool on the rear floor body and is in smooth transition with the peripheral connecting surface; the cross-shaped boss divides the bottom face of the spare tire pool into four areas, a rectangular boss is arranged in each area, and the rectangular bosses are in smooth transition with the peripheral connecting face. On the basis that the weight is not increased, theuse performance such as rig