The invention discloses an emergency warning board control method for vehicle-mounted accidents. The method comprises the steps that a vehicle running state is acquired, and whether or not a vehicle is in an abnormal running state is judged; if yes, a weather condition of an area where the vehicle is located is acquired; according to the weather condition of the area where the vehicle is located,display parameters of a warning board are set, and display is conducted according to the display parameters of the warning board; whether or not a barrier is located in front of the warning board is detected, and the height of the warning board is increased or decreased according to a detection result.