The invention discloses a video synchronization method based on homograph and is used for solving the technical problem that in the prior art, a video synchronization error is relatively high when moving targets carry out non-planar movement. The method comprises the realization steps of carrying out moving target trajectory extraction and background image matching on input videos; obtaining antipodal points of background images; normalizing moving target trajectories and feature points and antipodal points of the background images; through utilization of the background points, the antipodal points and trajectory points, obtaining initial trajectory point matched pairs based on the homograph, and removing wrong trajectory point matched pairs through adoption of epipolar geometry constraints; and extracting time information of the trajectory points, and calculating time model parameters between the input videos through utilization of a random sampling consistent algorithm. According tothe method, when the moving targets carry out the non-planar movement, a relatively high accurate matching ratio can be obtained, and the method is applicable to the field such as multi-video monitoring, target tracking, video splicing, three-dimensional reconstruction and video fusion.