The utility model provides an automatic flow control system for a lab. The automatic flow control system for a lab comprises an industrial control computer, a niloscope, a digital quantity output card, a plurality of relay output plates, a plurality of solid relays and a plurality of water pumps. One end of the niloscope is connected with the industrial control computer, and the other end of the niloscope is connected with a water level sensor which is arranged on the water surface. One end of the digital quantity output card is inserted on the mainboard of the industrial control computer, and other end of the digital quantity output card is connected with the relay output plates via flat cables. One end of the relay output plates is connected with the digital quantity output card, and the other end of the relay output plates is connected with the plurality of solid relays. One end of each solid relay is connected with one relay output plate, and the other end of each solid relay is connected with one water pump. The automatic flow control system is convenient in operation and can be widely used for generation of non-constant current in a lab, such as flood simulation and current system simulation.