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The 0.6m trisonic wind tunnel control system adopts an open distributed system based on Fieldbus and network, which has many operation control equipments and complex logic relationship,to ensure the state monitoring and operation safety of wind tunnel complex system, a safety interlocking control system is developed. The hardware of the system includes upper computer of application layer, the middle layer PLC, and the device terminals of execution layer. The software uses the shared variable server SVE to manage the communication in a unified manner, the combination of hardware circuit and ProfiNet connection realizes the state information detection and control instruction sending of each device of wind tunnel. Through the analysis of the status monitoring and safety protection functions of wind tunnel, the key technologies and methods of three-level redundant safe shutdown strategy are adopted. After debugging, all information and equipment related to the safety of wind tunnel operation are detected and controlled. When abnormal operation of wind tunnel occurs, the control right can be preempted, and the shutdown of all equipment in safe state can be controlled. The pressure control precision is better than 0.5%. The practical application of the wind tunnel meets the engineering application of protecting the safety of the wind tunnel equipment and the test personnel technically.