Abstract: Improve the irrigation rate of vegetable greenhouse in China and solve the problem of hindering agricultural development at the present stage.Nowadays,vegetable greenhouses emphasize precision irrigation,which can be realized by adding automatic control technology.The combination of computer technology and automatic control technology has become the trend of agricultural development.Monitor and control the irrigation efficiency and effect of the greenhouse in real time,and select the irrigation mode conducive to the growth of crops.According to the current situation and shortcomings of the application of irrigation automation technology in vegetable greenhouses at home and abroad,a water-saving irrigation system with PLC as the control core is studied and designed.The wireless control is realized by using GPRS as communication,and the reasonable regulation is carried out according to the ratio between the real-time data fed back by vegetable greenhouses and the set value.In the selection and application of equipment,the reliability and economy are balanced,and the measures that can be taken when the system is disturbed are put forward.The results show that the control system has stable operation and simple operation.It can improve the irrigation water-saving rate and has broad prospects.