The present disclosure provides an optical lens and a manufacturing method thereof, wherein the optical lens comprises: a lens barrel and at least one lens sheet fixed in the lens barrel, wherein the lens sheet on the most object side is overlapped by the lens barrel on a side surface and an upper surface of the lens sheet, wherein the lens barrel comprises a main body and an edge fastener, and wherein the edge fastener integrally extends from the main body and overlaps the lens sheet on the most object side, so that the lens sheet is smoothly wrapped and fixed to the lens barrel. In the case where the stability of the lens sheet on the most object side is ensured, excessive stretching and bending and excessive deformation of the lens barrel is avoided at the same time, thereby improving the reliability of the overall structure.