The utility model relates to a method for using an anti-dumping device of a motor vehicle, which comprises a frame, a left supporting leg, a right supporting leg and a control device. The control device comprises a speed control switch, an inertia switch and a controller. When the motor vehicle is tilted, the controller controls the left electric push rod to drive the left buffer to move and support the ground, and locks the left drive rod of the left electric push rod by using the left electromagnetic lock; Alternatively, the controller controls the right electric push rod to drive the rightbuffer to move and support the ground, and locks the right drive rod of the right electric push rod by using the right electromagnetic lock; Avoid dumping of motor vehicles and reduce the burden of foot support on drivers; When the motor vehicle is running, the controller controls the left electromagnetic lock and the right electromagnetic lock to be unlocked. After the left electromagnetic lock or the right electromagnetic lock is unlocked, the controller controls the left and right electric push rods to drive the left and right buffers off the ground, or the controller controls the right electric push rods to drive the right buffers off the ground, so as to avoid affecting the running of the motor vehicle.