The invention provides a laser projection system, which realizes the decoherence in a laser projection device by using natural movement in an application environment thereof and saves a decohering device used in the prior laser projection system, thereby achieving compact structure and sable performance, improving the utilization rate of laser and reducing system cost. In addition, the laser projection system adopts a laser light source, so the service life of the system is improved greatly and the color range of projected image is wide and the color of the projected images is bright.