The invention relates to an automobile tire safety device and a working method thereof. The device comprises an inner ring (1), an intermediate ring (2) and an outer ring (3), wherein the inner ring (1) is fixedly connected with the outer circle of an automobile tire hub (14), the intermediate ring (2) is arranged between the inner ring (1) and the outer ring (3), the outer ring (3) and the intermediate ring (2) form a free-slip contact, the intermediate ring (2) and the inner ring (1) form a free-slip contact, the cross section of the intermediate ring (2) is a concave-convex shape, the surface shape of the outer circle of the inner ring (1) is matched with the surface concave-convex shape of the inner circle of the intermediate ring (2), and the surface shape of the inner circle of the outer ring (3) is matched with the surface concave-convex shape of the outer circle of the intermediate ring (2); and the inner ring (1), the intermediate ring (3) and the outer ring (3) are encased in the an automobile outer tire. The device can decompose the instant impact stress, transfer the friction force by speed difference, prevent the direction from being out of control and keep the original running speed and direction of wheels invariant as much as possible.