In order to improve the anti-electromagnetic interference capability of the electronic equipment on blast field， the characteristics of electromagnetic radiation generated by high explosive were studied. An electromagnetic radiation measurement device based on ultra-wideband omnidirectional antenna and shortwave omnidirectional antenna was designed while 8 test points were set up for electromagnetic radiation measurement of 60 kg TNT explosion. The experimental results showthat the electromagnetic radiation signals generated by TNT explosion last up to 600 ms after the explosion， the most intense period of electromagnetic radiation signal produced by TNT explosion is from 80 ms to 110 ms after the explosion. The frequency of the electromagnetic radiation signals generated by the explosion is mainly concentrated below 100 MHz， where the energy distribution in the low frequency band which below 50 MHz is the most obvious. The distance of the center of explosion hasa significant effect on the spectrum distribution of electromagnetic signals， and the frequency distribution of electromagnetic radiation in different directions was inconsistent. The electromagnetic radiation intensity generated by TNT explosion mainly ranges from 64.33 V·m^-1 to 348.25 V·m^-1， and the electromagnetic radiation intensity decreased largely with the increase of detonation distance. The electromagnetic radiation intensity measured by test points in different directions also hasa certain gap， and the difference ranges from 11.1% to 17.7%.