When transporting steel coils in the finished steel coil warehouse, operators use the workshop crane to complete the task; while the grabbing of steel coils is completed by a spreader or mechanical arm installed on the crane. Grabbing items with a spreader is a complex process. In the process of grabbing steel coils, the most critical technology is to control the spreader to accurately position the steel coil and complete the grabbing action. The steel coil grabbing systems currently in use in the world generally require an experienced operator to remotely manually control the robot spreader in order to achieve precise positioning of the robot or spreader. The requirements for the operator are very high, otherwise it will be difficult to achieve high precision. The spreader and the steel coil will often collide with each other due to the operator's inaccurate positioning, causing damage. The manual control of the crane's start-stop and transportation lines will be arbitrary and blind, making the crane's operating efficiency inefficient, resulting in a waste of energy in the equipment and increasing transportation costs. The crane system is also called an automatic material handling system. Nowadays, unmanned automatic crane systems are used in many steel coil finished product warehouses. Compared with manual operation to clamp steel coils, the unmanned crane system has indeed improved efficiency and saved money. Artificial. However, there is a problem with the current crane system. Although the positioning of the existing crane system is relatively accurate, it cannot guarantee the accurate positioning of the steel coils, and incomplete grabbing of the steel coils will inevitably occur.