The invention discloses a production method of an array substrate, and a display device. The production method comprises the steps of providing a substrate; arranging metal layer material on the substrate; arranging thermal reaction photoresist on the metal layer material; using photomask and thermal reaction processes to acquire a thermal reaction photoresistance layer; and performing etching to acquire a metal layer. A display panel formed by the array substrate produced by using the method can be effectively improved in resolution, display effect of the display panel is further improved, and market competitiveness of the display panel is effectively enhanced.