Precise measurement of vehicle dynamic roll angle is significant in vehicle control and assisting safe driving. Because direct measurement of vehicle dynamic roll angle is difficult,a method to measure vehicle dynamical roll angle based on laser and image processing was presented. The laser devices and an imaging unit were fixed on the vehicle body,and real-time laser images were obtained. According to the geometrical relationship of vehicle body,road surface,laser spots and imaging unit,real-time vehicle roll angle was calculated through image processing. The experimental results show that this method is simple and convenient,and vehicle motion has no influence on it. It has a great practical value for a variety of related experimental researches on the measurement of vehicle dynamic roll angle.