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Aiming at the problem that traditional analytical models, signal processing and knowledge methods are affected by information transmission delays and resulting in low diagnostic accuracy, a design of a fault diagnosis system based on Beidou satellite communication for aerospace measurement and control frequency bands is proposed. The hardware structure is designed with a wave-head signal detection module to determine the type of fault; the weak signal sent by the satellite is received through the ground receiver, and the number of local crystal oscillator pulses is calculated to modify the Beidou satellite communication data. The Beidou timing module is used to ensure the accuracy of the output time and avoid the delay problem. The software part uses logical reasoning to design the fault diagnosis process of the aerospace measurement and control frequency band, and uses the Beidou satellite diagnosis technology to correct the error. It can be seen from the experimental results that the system's signal line loose pulse signal diagnosis result is consistent with the actual situation, the gyro output angle drift is consistent with the actual value, and the error is 0, which has an accurate diagnosis result.