A Automatic Gain Control(AGC) algorithm for Solar Blind Ultraviolet Enhanced ICCD(SBUV-ICCD) was proposed to detect the targets with different radiation luminances and to avoid damaging the device when it was exposed to high intensity radiation. The sum of N consecutive frame histograms were treated as an analysis object, and it was divided into background section, target section, brightness section and saturated section. The AGC algorithm was accomplished by using the proportion factor of brightness section to target section and the coefficient of saturated section to brightness section as controlling parameters. Finally, experiments were designed for testing the algorithm performance. Through controlling saturate ratio below 0.2 and bright ratio in the range of 0.4-0.8, experimental results indicate that the algorithm can adjust the gain of ICCD quickly and effectively in 1-3 s whenever the target's luminance is up unexpected rapidly or changed slowly, obtained results show that proposed algorithm can offer a good image resulution while the camera is protected.