Abstract: A manufacturing method of a light bar includes providing a hard substrate; electrically connecting multiple optical source chips on the substrate, the multiple optical source chips being arranged along a length direction of the substrate in a predetermined spacing; and encapsulating the optical source chips and a top surface of the substrate with encapsulation polymer, thereby a topmost surface of the encapsulation polymer on the optical source chips and the substrate being located at the same level. The light bar obtained has efficient light coupling, simple and efficient manufacturing process, and meets requirements of compact and light product.