A pixel defining layer, a manufacturing method therefor, and a display panel are provided. The pixel defining layer comprises a first sub-defining layer, a light absorbing layer, and a second sub-defining layer sequentially stacked on a substrate. The light absorbing layer is used for absorbing light for exposing the first sub-defining layer. An orthographic projection of the light absorbing layer on the substrate covers the outer edge of an orthographic projection of the first sub-defining layer on the substrate away from the surface of the substrate.