The utility model relates to a
fuel tank mounting structure and an automobile, the
fuel tank mounting structure is arranged at the position of a rear floor of an automobile body, the rear floor is provided with a rear cross beam and a front section part which are arranged at an interval along the front-back direction, the
fuel tank mounting structure comprises a front connecting piece and a rear connecting piece, the front connecting piece is arranged at the front section part, and the front connecting piece is provided with a
closed cavity; the front support
assembly is connected to the front connecting piece, and the front support
assembly is used for connecting the fuel tank to the front connecting piece; the rear cross beam connecting piece and the front connecting piece are arranged in a spaced mode, and the rear cross beam connecting piece connects the side, away from the front connecting piece, of the fuel tank to the rear cross beam. The
oil tank is mounted at a rear cross beam of the rear floor through a rear cross beam connecting piece; the front connecting piece is provided with the
closed cavity, so that a fuel tank mounting front beam can be omitted, and the weight of the front connecting piece can be reduced; by arranging the rear cross beam connecting piece, a rear beam for mounting the fuel tank can be omitted, and the fuel tank can be stably fixed.