AGV car system involves many fields such as machinery, electronics, optics and computers. However, in the installation process of AGV unmanned vehicle system, safety issues are very important, and preparations must be made in the initial stage of system installation. This serves two purposes. First, to prevent the collision between vehicles and human collision. Second, when the collision avoidance system failure occurs to the AGV loading and unloading robot, it should immediately stop the platform and wait for the maintenance personnel to repair.