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Absrtact: Aiming at the inaccuracy of the current fault detection system when detecting the network communication fault signal, a network communication fault detection system based on joint compressed sensing reconstruction is designed. Combined with the theory of joint compressed sensing, the overall structure of the system is designed. The optical time domain reflectometer F7 high-end carrier-grade optical cable fault optical fiber tester OTDR is selected as the system hardware. According to the working principle, the transmission characteristics of the communication network are judged, the menu button is set, the zoom, the equal ratio, and the detected waveform are restored. The AD8066 low noise amplifier is used to design a current-to-voltage conversion circuit. A capacitor is connected in parallel across the feedback resistor to suppress noise, and a 24-40W laser driver is used to supply current to the laser power source to convert the pulse signal into an electrical signal. Under the J2SE platform, the design center service function transmits a positive pulse through the laser drive, and the Gray complementary code is biased to about half of the peak value. The Gray complementary code is applied in the OTDR, and the network communication fault detection is completed according to the system detection process. The system performance test results show that the detection result of the network communication fault signal based on the joint compressed sensing reconstruction detection system is more accurate, and the error is 0.3dB, which lays a foundation for network operation and maintenance.