Aiming at the detection of Multi-Circle, a novel method based on a combination of circular symmetry and rotation transformation is proposed. According to the circle geometrical properties, taking the straight line as axis of symmetry through the center of circle and paralleling to abscissa, symmetric points named point set P1 are searched from the points on the edge of the image. After the image rotated, symmetric points are searched from it, with reverse rotation transformation, and named point set P2. Making use of circle rotational symmetry, the point set that is the intersection of P1 and P2 is on a circle, which will realize the detection of circle. Compared with Randomized Hough Transform (RHT) and Randomized Circle Detection (RCD) which are most widely applied, the experimental results show that the algorithm has the advantages of rapid detection and simple implementation.