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The state advocates the use of precast concrete members. The traditional natural curing method of concrete takes a long time and is limited by ambient temperature. According to the curing characteristics of concrete, the curing technology of precast concrete members is studied, and an intelligent cyclic curing system is designed, selection of hardware design is completed, and software control method is given. By placing heating system and humidifying system under the die, and using folding curing cover to form a closed space for the die. According to the collected temperature and humidity, the CPU controls the heating power of the frequency conversion heating furnace and the opening and closing of the solenoid valve of the steam humidification system, so as to realize the function of temperature and humidity control. Through the engineering application test, the system achieves good results. During the heating stage, the temperature reached 55℃ in 2 hours and the humidity reaches 90%. During the constant temperature stage, the temperature was maintained at 46 ~ 60℃ for 8 hours and the humidity≥90%.