Aim at the problem of rapid and high precise calibration in stereovision system, a calibration method for stereovision system based on solid circle target is proposed. The Canny-Zernike combination algorithm is used to locate the sub-pixel coordinates of circle center, and a sorting method for circle center based on a triangle target is given in detail. To reduce the computational complexity, the Levenberg-Marquardt (LM) algorithm is utilized to separately optimize the left and right camera for decreasing the number of optimal variables by half. The distance between two circle centers on diagonal direction of calibration board is regarded as the constraint, and the external parameters of cameras are optimized with LM algorithm. The calibration software for stereovision system based on solid circle target is complied, and the testing is performed in lab. Result shows that the proposed method has high precise, can achieve the automatic calibration and apply to engineering.