The invention discloses a proximity electric alarm device and a method thereof, comprising an electromagnetic field sensor, an induced current pickup module, an amplification module for a high power instrument, a power frequency detection filter module, a signal conditioning module, a processor, a button control module, a display module, Sound and light alarm module and power supply; The processor is used for sampling, frequency domain analysis and processing to the signal, calculates the corresponding electric field strength signal and the distance from the field source (transmission line), and displays it through the display module, and simultaneously according to The alarm threshold is used for sound and light alarm through the sound and light alarm module. The present invention can detect electromagnetic induction in a high-voltage and strong electromagnetic environment, and can notify whether there is a high-voltage charged object or a strong electromagnetic field nearby through a sound alarm signal, and quickly, safely and reliably remind the parties to pay attention to vigilance or quickly evacuate from a dangerous situation, effectively ensuring Personal and equipment safety issues.