The invention provides an array substrate, a display panel and a manufacturing method of the array substrate. The array substrate is provided with a display area and an under-screen camera area, and comprises a substrate, a driving circuit layer, a flat layer, a common electrode layer, an insulating layer and a pixel electrode layer which are sequentially arranged in a stacked mode from bottom totop, wherein the flat layer is provided with a groove in the under-screen camera area. The display panel comprises the array substrate. According to the invention, the groove is formed in the flat layer in the under-screen camera area, so that the thickness of the liquid crystal layer of the display panel in the under-screen camera area at the position corresponding to the groove is increased, thus the thickness of the liquid crystal layer is increased to about five microns from about three microns in the past, the optical path of light passing through the liquid crystal layer is increased, the scattering effect of the light is improved, the haze of the liquid crystal layer is increased, the technical problem of low haze of the under-screen camera area is solved, the contrast ratio of theunder-screen camera area is improved, and the image display effect is enhanced.