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A dedicated safety interlock and status monitoring system has been developed for a jet wind tunnel system with complex architecture, multiple control objects and hydraulic mechanisms, flexible adjustment of model support mechanisms, and continuous adjustable Mach numbers. The system fully utilizes advanced fieldbus and real-time network technologies such as Profinet, builds a hardware platform based on Siemens S7-1500 series PLC as the core controller, and independently develops a real-time monitoring software system. It solves technical problems such as fast data exchange between multi-layer/multi-source control subsystems, simulation operation strategy before testing, and establishes reliable safety interlocking logic and three-level shutdown mechanism. The static and dynamic testing of the system shows that it is suitable for wind tunnel tests within the Mach number range of 0.3~3.5. The fast valve opening and closing time is better than 10 seconds, the pressure regulating valve opening and closing time is better than 2 seconds, the pressure monitoring accuracy is better than 0.1%, the valve opening monitoring accuracy is better than 0.1mm, the monitoring and control adjustment cycle is better than 100ms, the system operates stably and smoothly, and the data is real-time and accurate, providing necessary software and hardware guarantees for the safety of wind tunnel personnel and equipment.