The invention discloses a camera calibration optimization method under a road cloud monitoring platform, which comprises the following steps of: automatically identifying geometrical identifications such as road edge lines and road dotted lines from a road traffic scene, and solving parameters such as orientation and focal length of a camera by utilizing a multi-identification fusion scene adaptive calibration method according to the data so as to complete calibration. And on the basis, if a redundant identifier exists, a calibration result can be optimized. The method can adapt to different road traffic scenes, and the pan-tilt camera is used for extracting a large amount of geometric information in the scenes to complete the camera calibration and optimization process. The method is simple to implement and good in universality, can be applied to camera calibration under various road scenes, and can optimize the calibration result.