A base and a manufacturing method thereof and a display device are provided, so that a problem of faultage of an insulating layer when forming the insulating layer on an aluminum electrode of a substrate is solved. The base includes an aluminum electrode in a first setting pattern on a substrate, and an aluminum oxide layer or an aluminum nitride layer (3) in a second setting pattern provided in a same layer with the aluminum electrode. The first setting pattern and the second setting pattern are complementary to each other.