The invention discloses an enclosed space electric field measurement device. The enclosed space electric field measurement device comprises a signal analysis single-chip controller, a signal front amplifier, a communication interface, a debug interface, a data forwarding power amplifier, a radio frequency filter, a power supply circuit and a color liquid crystal display, wherein the signal front amplifier comprises an inductive transducer and a dual operational circuit, the signal analysis single-chip controller is connected with the communication interface, the debug interface, the data forwarding power amplifier, the color liquid crystal display and the dual operational circuit, and the dual operational circuit is also connected with the inductive transducer. The enclosed space electric field measurement device can perform waveform recording and time-domain and frequency-domain analysis on electromagnetic waves in an enclosed space, and accordingly, carries out cable fault positioning determining analysis in the enclosed space. The enclosed space electric field measurement device has unparalleled accuracy and real-time performance in determining and positioning faults in a cable trench than any other technical means.