The invention discloses a pixel circuit, a drive method of the pixel circuit, an array substrate and a display panel. The pixel circuit comprises a first transistor, a second transistor, an organic light-emitting diode and a voltage stabilization unit. According to the pixel circuit, because the voltage stabilization unit is arranged between the second electrode of the first transistor and the grid electrode of the second transistor serving as a driving tube, even through second signals received by a second signal input end are unsteady because of capacitive coupling and electric leakage on the periphery of the pixel circuit or attenuation in one frame of display, steady voltage signals can be obtained after the signals pass through the voltage stabilization unit, the voltage signals are applied to the grid electrode of the second transistor, the second transistor can be stably controlled, and therefore the open second transistor can obtain steady drain electrode current, the current flowing through the organic light-emitting diode can be more stable, and the display effect of the display panel can be improved.