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Aviation structural parts are an important part of aircraft. The quality of automatic flexible tooling of aviation structural parts directly affects the flight safety level of aircraft. In order to reduce the position and attitude control errors of the system and reduce the wear area of aviation structural parts, a PMAC based distributed control system for flexible tooling of aviation structural parts is designed. PMAC motion controller is used to receive feedback signals from electronic components and control stepping motor, DC motor and AC motor. The hardware system is designed by combining industrial computer, positioner, servo motor and distributed communication network. According to the structure and working principle of flexible tooling operating equipment for aviation structural parts, the corresponding model is constructed. The position of the flexible tooling on the target surface is determined, and the control quantity of the flexible tooling is calculated from the moving position and assembly force. Under the function of PMAC controller, the distributed control function of flexible tooling for aviation structural parts is realized by adjusting the position and attitude of the system. The system test results show that the position and attitude control errors of the designed distributed control system are reduced by 13cm and 0.32 ° respectively, and the wear area of aviation structural parts under the control of the designed system is small.