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In order to solve the problems of fuzzy selection parameter standards of the humidification system of the existing potato ventilated storage and the inability of the humidification method to automatically adjust with the changes of the environmental parameters in the storage, a set of automatic humidification system for the potato storage was designed and developed. The humidification system was based on the existing potato storage, combined with the physiological characteristics of the potato, selected PLC S7-200 as the main controller for development, and the control variable method was used for experimental design. Through the data analysis software Origin, a single factor test analysis was carried out on the relationship between the various influencing factors and the inlet wind speed and relative humidity, and the influence of the thickness of the humidification curtain, the power of the humidification pump and the wind speed of the fan on the humidification effect of the storage was obtained. Through experimental research, it was concluded that the best collocation plan for the storage warehouse was that the thickness of the wet curtain was 45cm, the power of the humidification pump was 70W, the wind speed of the fan was 16m/s, and the full penetration effect can be achieved when the wind speed reached 16m/s. The application test of the humidification system proves that the system can work normally and can meet the humidification requirements of potato storage. It can be adjusted according to the changes of environmental parameters in the warehouse, so that the potato can maintain sufficient moisture and low weight loss rate, and guaranteed the storage in the warehouse. The environment was suitable for the storage of potatoes.