Based on the measuring method of manual rainfall infiltration with the Mariotte bottle, an indoor automatic measurement system for rainfall infiltration with PLC(programmable logical controller)and touch panel was designed. This system could automatically water to the Mariotte bottle, adjust rainfall intensity, display and record experiment data in real time, and also provide the function of data query. The PLC collects the analog signal and transforms it into a digital signal, which is used to control the water input of the Mariotte bottle to regulate water level through switching the two electromagnetic valves. In addition, the PLC controls regulating valve opening to adjust the rainfall intensity. Furthermore, this system can be operated easily, rationally reflect the infiltration process, and give a high precision measurement.