The invention discloses an automobile anti-rolling device in the technical field of traffic safety. The device aims at solving the problems that guardrail type protection devices in the prior art cannot be arranged at too low positions, thus the protection effect is limited, sensor type and pop-up type protection devices are not agile in response, and the economic cost is too high. The device comprises a rotating part, a linear moving part and a blocking arm which are connected with one another in sequence, and the device is connected to an automobile through the rotating part; the linear moving part can rotate around the rotating part in the direction of wheels to press the wheels when driven by the blocking arm, and at the same time, the linear moving part performs self-axial extension,so that the height of the blocking arm is adapted to the height of a lying-down person in danger.