The invention relates to an automatic anti-rollover device of a two-wheeled motorcycle. Telescopic pipes and telescopic springs are arranged in guide pipes of two sets of telescopic devices, universal wheels are connected below the telescopic pipes, lock tongues of electric control locks are inserted at the upper parts of the guide pipes, backstop cards of backstop devices are inserted at the middle and lower parts of the guide pipes, contact frames of contact devices and contact pieces on the inner sides are connected with electrical contact pieces through contact directional pins of conicalsprings which are sheathed outside, and a power supply is conducted with electromagnetic coils in the electric control locks, the contact pieces on the contact devices and a manual contact switch. The telescopic devices are arranged at the lower parts on two sides of a bumper arranged at the front and middle part or the treading positions of a rider, and the contact devices are mounted on shock absorbing rods on two sides of the center of a front wheel of the motorcycle and the front end and the back end of a rain cover. The automatic anti-rollover device can be equipped on the two-wheeled motorcycle, when the front part is collided, the contact pieces are in collision with the electrical contact pieces; or an accident is foreboded to happen, the manual contact switch is started, a circuit is conducted, the lock tongues of the electric control locks retract, the telescopic springs can expand the telescopic pipes, the backstop cards of the backstop devices can stop the telescopic pipes, the universal wheels are in contact with the ground, and the motorcycle increases two pivot points, thereby effectively avoiding rollover.