Abstract: This paper introduces a high-precision and continuously tunable medium bounded-wave electromagnetic pulse simulator, which adopts a widely tunable, automated novel high voltage pulse source of compact size with fast rise time. Based on fiber transmission automation control is realized, anti-jamming problem is solved and HEMP simulation ability is promoted. Parameters of the simulator are: the rise time about 2.5 ns, FWHM about 23 ns, working volume 4 m×4 m×5.8 m, output continuously tunable electric field from 0.2 kV/m to 60 kV/m.