Cooperative robot is originally a tool for human interaction and safety, but because people are still worried about the risk of strong collision between human and robot in the field operation, the speed of robot is generally lowered to reduce the collision risk, but this will reduce the efficiency of robot. After the safety warning box is installed, when people enter the preset 2 meters range, they will immediately send a signal to slow down the robot, thus reducing the risk of strong collision. When people leave the early warning range, the robot will immediately return to normal speed, greatly improving efficiency and reducing safety risks.