The present disclosure proposes a GOA circuit having GOA units connected in a serial. Each GOA unit includes a scan-control module, an output module, a pull-down module, and an output adjusting module. By using the output adjusting module formed by a ninth TFT, a tenth TFT, an eleventh TFT, and a twelfth TFT, the voltage level of a fourth node transits between the high voltage level and the low voltage level with the second clock signal in either forward scanning or backward scanning. Compared with the conventional technology where the high and low voltage levels of the output terminal are mainly realized using the second TFT, the GOA circuit realizes that the output ability of the output terminal enhances and the charging capacity of in-plane pixels upgrades in the same period of time to improve the display effect of the liquid crystal panel.