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In the magnetic haptic rendering system, the quality of the electromagnet coil winding determines the authenticity and immersion of the haptic rendering. This paper designs and develops an electromagnet large coil automatic winding system based on hand winding machine, stepping motor, electric cylinder, tension controller, STM32 and other modules. The cable control algorithm based on STM32 is studied, which realizes the automatic winding and wire arranging of large-size coil. Taking coils as the research object, the reliability of the automatic winding system was verified by comparing with the effect of manual winding. The feasibility of coil winding quality is proved by comparing the resistance value of the actual measuring coil with the theoretical value. The system provides an effective solution for large-frame multi-strands winding. It has important research for magnetic haptic rendering.