The utility model relates to an anti-rob device for a vehicle, solving the problem of robbers commit a crime on the vehicle particularly a car. The device is arranged beside a cab seat, a figure-seven swing stem is arranged, one end of the figure-seven swing stem is arranged on a base, and the turning corner of the figure-seven swing stem is movably connected with a power piston. The other end of the power piston is arranged on the base and connected with a switch valve, and the switch valve is connected with a high-pressure gas cylinder. The swing stem is also provided with a short forked active swing stem connected with a steel cable fixed to the base, and the lower end part of the swing stem is also provided with a locking device. The device can lock the robbers on the cab seat quickly. When the robbers have weapon, the driver can start a high-pressure electric shock gun simultaneously to shock the robbers in a short time in order to obtain the aims of overwhelming the robbers and protecting the driver.