A gate drive circuit comprises a plurality of gate drive units, comprising a pull-up control unit connected with a first node, a second node, a first clock signal, a scanning signal output end, a current-stage stage transmission signal output end and a preceding-stage transmission signal output end; a pull-down maintaining unit, connected with the first node, the second node, a current-stage feedback signal output end, a next-stage feedback signal output end, a scanning signal output end, a current-stage transmission signal output end, a first direct-current high voltage, a first direct-current low voltage and a second direct-current low voltage; a pull-up unit, connected with the first node, a second clock signal and a scanning signal output end; a downloading unit, connected with the first node, a second clock signal, a second direct-current high voltage, a local-stage feedback signal output end and a local-stage transmission signal output end; a pull-down unit, connected with the first node, the second node, the scanning signal output end, the next-stage cascade signal output end, the first direct-current low voltage and the second direct-current low voltage; and a bootstrap capacitor, one end of the bootstrap capacitor being connected with the first node, and the other end being connected with the scanning signal output end.