The invention belongs to the technical field of electric cars and particularly relates to an electric car chassis with a transverse swaying and suspended battery pack. The electric car chassis comprises a battery, a battery pack shell and a bottom plate. The battery is fixedly mounted in the battery pack shell, the battery pack shell is rotationally connected to the bottom plate, and dampers for providing resistance for rotating of the battery pack shell relative to the bottom plate are arranged between the battery pack shell and the bottom plate. Rigid connection between the battery pack andthe bottom plate is omitted and changed into elastic damping connection, thus the battery pack has the degree of freedom for rotating relative to the chassis, the influence of the rotational inertia of the battery pack on car steering is reduced, and the control stability of a car is improved under the premise that the size and mass of the battery are not affected. The structure is compact, the occupied space is small, rising of the gravity center of the car is not obvious, and the rolling performance of the car is improved. The structure is simple, and the control stability of the car can beimproved greatly only through little change on the basis of an existing car chassis.