This paper uses WinCC configuration software and based on the mathematical model of Coupled-Tank, which writes the program code through C script, solving the tank differential equation by Euler method, and uses the incremental PI algorithm to achieve closed-loop control, and then achieves the purpose of liquid level control. The development of this platform not only enables operators to understand the workflow of the Coupled-Tank, displaying of liquid level changes on real-time, real-time monitoring, and dynamic simulation of liquid level changes of the tank, but also can achieve the effect of online modification of parameters and manual and automatic No disturbance switching in the operating mode.