In order to solve these problems of complex transmission structure, large load and high accuracy requirements of certain type hypersonic wind tunnel attack angle mechanism, a control system scheme using EtherCAT as a bus was designed. According to the control system requirements of the attack angle mechanism, BECKHOFF products are used to build the electromechanical-hydraulic integrated control system architecture of the attack angle mechanism. TwinCAT and C# languages are used to develop the control system PLC and upper computer HMI software, and the ADS communication protocol is used to realize HMI and PLC program communication, and use the OPC UA communication protocol to realize the data interaction between the attack angle mechanism operation data and the wind tunnel operation system. The results show that the system meets the control requirements of the attack angle mechanism, and it can solve the problem of information islands of the attack angle mechanism, and improves the information and intelligence level of the wind tunnel system.