The invention discloses a false trajectory privacy protection method based on time-space correlation. The method analyzes the overall direction of the trajectory, the time reachableness between adjacent positions in the trajectory, the time-space correlation between the moving distance and the space between two adjacent positions in a single trajectory. From both the partial and integral angles, the method takes consideration of the time-space correlation of two adjacent positions in a single trajectory and the time-space correlation between trajectories, proposes the false trajectory privacy protection method. The safety analysis indicates the method can confound the real trajectory with the false trajectory. Large quantity of experiments indicate that the method has little calculation cost, at the same time, compared with the prior art of privacy protection method, has lower privacy leakage rate of the real trajectory, thus effectively protecting a user's trajectory privacy in the release of trajectory.