The invention relates to automotive chassis middle segment, an automotive chassis with the automotive chassis middle segment, and an automobile with the automotive chassis. The automotive chassis middle segment comprises a left longitudinal beam, a right longitudinal beam and a middle longitudinal beam. The middle longitudinal beam comprises a middle upper longitudinal beam and a middle lower longitudinal beam. diagonal braces for connecting the middle upper longitudinal beam and the middle lower longitudinal beam are arranged between the middle upper longitudinal beam and the middle lower longitudinal beam; the left longitudinal beam comprises a left upper longitudinal beam and the left lower longitudinal beam; no diagonal brace exists between the left upper longitudinal beam and the left lower longitudinal beam; the right longitudinal beam comprises a right upper longitudinal beam and the right lower longitudinal beam; and no diagonal brace exists between the right upper longitudinal beam and the right lower longitudinal beam. The area between the left longitudinal beam and the right longitudinal beam in the middle segment of the automotive chassis and the adjacent middle longitudinal beam, and can be used for placing a battery or a luggage. Furthermore, in the operation process of the automobile, bending and torsion which are bear are transmitted to each part of the whole automotive chassis through the longitudinal beams, the diagonal braces and a cross beam; wherein the longitudinal beams, the diagonal braces and the cross beam are connected. A vertical closed force loop and a front-and-back closed loop are formed. The bending force and the torsion force are transmitted and dispersed one by one, thereby gradually reducing the bending force and the torsion force, so that the automotive chassis middle segment satisfies a strength requirement and a rigidity requirement.