The catenary is powered by single-phase industrial-frequency power dividing into multiple sections, the acquisition of power feeder voltage, neutral-section voltage and other electrical signals are the foundation to ensure the train automatic-passing the neutralsection. Aiming at the fault of electrical signal measuring circuit caused by sensor insulation aging, the fault diagnosis and fault-tolerant control method of ground automatic passing neutral-section’s measuring circuit is proposed. Based on the mechanism analysis of different measuring circuits, such as power feeders and neutral-section, this method gives a fault diagnosis method based on the mutual check of circuit information, and constructs the corresponding fault-tolerant control scheme according to the fault characteristics of different measuring circuits. Finally, the results of simulation and practical project show the effectiveness and reliability of the proposed method.