In order to realize the rapid extraction of the center coordinates for a row billet end faces when labeled by multi-strand billet end face labeling robot, the research program was proposed that the image coordinates of four corners in billet end face image were extracted firstly and then the center point’s coordinates of the billets end face image are calculated. Firstly, improved SUSAN corner detection algorithm is proposed to solve the corner leak detection problem that the distance between the adjacent billet image edge is too small and the billet image corner angle is the arc angle. Then, the image plane coordinates of corners point is extracted, and the number of the billets end faces image in each enclosed area is calculated. Finally, according to two cases of the closed area includes one or more billets end face image,the center point image plane coordinates of each billet end face is calculated respectively. The robot labeling experiment of each billet end face in a row billets was carried out, and experimental results indicate that the horizontal and vertical labeling position error range of each billet end face is -0.625~0.85mm and -0.55~0.875mm respectively, which meets the enterprises allowed center coordinates position error value 1 mm of the billet end face fully.