A gate driver unit, a gate driver circuit and a driving method thereof, and a display device are disclosed. In the gate driver unit, an input module is configured to pull up a voltage at a pulling-up node to a high level, the pulling-up node being a connection node of an output end of the input module and a control end of an output module; the output module is configured to output a gate driving signal under a control of a second dock signal; a pulling-up module is configured to reverse the voltage at the pulling-up node under a control of a fourth clock signal; a pulling-down module is configured to reverse a voltage at an output end of the output module under a control of the second clock signal; and a reset module is configured to reset the output end of the output module.