The invention discloses a device for keeping an automobile body stable after tire burst. The device comprises a hub, a tire, a tire pressure monitor, a controller, a gas supply device and an auxiliary supporting device, wherein the tire is mounted on the outer circle of the hub; the auxiliary supporting assembly is arranged in a gap between the outer circle of the hub and the tire and comprises a supporting ring and a plurality of supporting assemblies which are uniformly distributed along the supporting ring; the tire pressure monitor and a starter of the gas supply device are electrically connected with the controller separately; and the tire pressure monitor can monitor a tire pressure change range in real time. After tire burst of an automobile, signals are transmitted to the controller, the controller transmits signals to the starter of the gas supply device, the gas supply device inflates the auxiliary supporting device, then the auxiliary supporting device can support the automobile body, the circumstance that the automobile body is out of balance due to impact caused by instantaneous distance from the automobile to the ground during tire burst is avoided, the heights of tires on two sides of the automobile can be stabilized in time, and the overall running balance of the automobile is guaranteed.