Abstract: Aiming at the difficulty in understanding the control principle and adjustment process of the double closed-loop ratio control, a hardware-in-the-loop simulation platform has been developed. It is composed of process flow analysis, double closed-loop ratio control scheme configuration, flow chart configuration, proportional, integral and derivative (PID) parameter tuning and simulation operation modules. It realizes the process analysis, sensor and actuator selection, control scheme design and automatic control loop operation of the double closed-loop ratio control system. The platform covers the theoretical knowledge of double closed loop control comprehensively, and the practice process is clear, operability and interaction are feasible. It emphasizes the deep integration of theoretical knowledge and practical problems, and cultivates students' problem-solving ability.