Array substrate and preparation method thereof, display panel and display equipment

The invention provides an array substrate and a preparation method thereof, a display panel and a display device. The array substrate comprises a substrate; the thin film transistor is arranged on the substrate, and the thin film transistor comprises a gate insulating layer; the first transparent electrode is arranged on one side, far away from the substrate, of the gate insulation layer; the barrier layer is arranged on one side, far away from the gate insulating layer, of the first transparent electrode; the passivation layer is arranged on the side, away from the first transparent electrode, of the barrier layer; and the second transparent electrode is arranged corresponding to the first transparent electrode and is arranged on one side, far away from the barrier layer, of the passivation layer. Wherein the material of the barrier layer is different from that of the passivation layer, and the barrier layer is used for blocking hydrogen ions generated in the preparation process of the passivation layer so a