The invention relates to an experimental system device for simulating water seepage of a covering rock stratum. The experimental system device comprises a frame, a rainfall simulating device, an open pit simulating device, a covering rock stratum simulating device, a water seepage data collecting device and a PLC (Programmable Logic Controller) control system, wherein the rainfall simulating device and the open pit simulating device are arranged on the upper part of the frame; the bottom of the open pit simulating device is connected with the covering rock stratum simulating device through a flange; the bottom of the covering rock stratum simulating device is connected with the water seepage data collecting device through the flange. The system device utilizes a sensor technique, a PLC control technique and a computer programming technique to realize the rainfall simulation, water seepage distribution collection and data collection, solve the technical problems of multipoint real-time data collection and greatly improve and increase the efficiency and accuracy of the water seepage experiment. The experimental system device is capable of recording and monitoring the whole water seepage process, collecting the related experimental data in real time and increasing the scientific level of the water seepage experiment of the covering rock stratum.