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At present, many manufacturers mainly use the traditional method of hot air circulation to heat the winding coil, and the study of drying process of the winding coil is not enough. Aiming at the problem that the traditional winding dip coating coil has a long drying time and poor insulation performance of the coil, a high degree of automation is designed and developed. The system is mainly composed of vacuum unit, temperature control unit, electric control unit, man-machine interactive unit and so on. The dipping coil placed in a vacuum environment, the impregnating coil is energized to heating and drying, using the programmable logic controller as the core, using the PWM output function of PLC control heating, and put forward the lacquer dry coil uniform experimental design, the optimum experimental drying process, finally through regression the analysis of experimental data obtained the relationship between each experimental index and significant. The experimental results show that the system can not only shorten the drying time, but also improve the insulation performance of the coil.