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In order to make the warning software can accurately identify the bad fault behavior of track circuit, the automatic warning system of track circuit bad fault based on fuzzy entropy is designed. With the help of RS485 to RS232 interface module, the power circuit is connected with the microprocessor component, display and alarm module, and the hardware design of the automatic warning system for the track circuit's bad branch fault is completed. According to the entropy properties, the conditions are defined and the fuzzy entropy parameters are solved. Based on this, the fuzzy characteristics of fault signals are analyzed, and the early warning principle of fuzzy entropy algorithm is studied. The structure model of encoder-decoder is improved, the range of warning limit area is defined according to the value result of warning index, the early warning system of track circuit bad branch fault is established, and the software design of automatic early warning system of track circuit bad branch fault based on fuzzy entropy is completed. Comparative experiments show that the fuzzy entropy based automatic warning system can control the difference between the non-fault voltage and the fault voltage within 0.05kV, which has outstanding application value in improving the system host's early warning ability for the bad fault behavior of track circuit branching.