The invention provides a gate drive circuit, a driving method thereof and a display device. The gate drive circuit comprises a plurality of first sub-drive circuits and a plurality of second sub-drive circuits. A plurality of gate lines at least comprise two adjacent first groups of gate lines, and a second group of gate lines arranged between the adjacent first groups of gate lines. Both ends of the first group of gate lines are connected to the first sub-drive circuits and the second sub-drive circuits. The first sub-drive circuits connected to the first group of gate lines are connected to the second sub-drive circuits connected to the adjacent first group of gate lines. Both ends of the second group of gate lines are connected to two first sub-drive circuits connected to the two adjacent first groups of gate lines. The first sub-drive circuits provide gate driving signals for the gate lines connected to the first sub-drive circuits. The second sub-drive circuits provide gate driving signals for the gate lines connected to the second sub-drive circuits. The split screen and the H-Block phenomenon are solved, and the problem that gate output voltages are not synchronous caused by non-simultaneous switching of gate drive integrated circuits is avoided.