Abstract: This paper introduces a design of automatic tracking car for cone winder. The automatic tracking car with independent structure and host completely torn off, with the battery as the power supply and DC motor direct drive as a power source. The photoelectric detector is installed, which could automatically find the plan ground paint marking and control of each wheel with electronic differential speed steering mode, complete control of the car. The car automatically along the paint marking running forward. By the microcontroller as the core control part, the controller is frequency effect, it can adjust the speed and the car pedal foot control, it could control of the car to start, speed, braking, forward and backward. Not only is suitable for the winding machine, and is suitable for twisting machine, machine and other types of car workers put yarn, inspection and operation.