The invention provides a manufacturing technology of a reflective layer on the surface of a circuit board for installing LED lamp beads, relates to a circuit board used for installing lamp beads in LED lamps, and belongs to the technical field of LED lamp manufacturing. The manufacturing technology comprises the steps of (1) placing one side, which is not provided with a circuit, of a circuit board upwards, cleaning the upper surface, polishing and smoothening the upper surface, and clearing chippings; (2) roughening the upper surface of the circuit board to obtain a rough surface with the surface roughness Ra of 4.8-5.6 microns, washing the circuit board and airing for use; (3) mixing and adding reflective materials and an adhesive to a coating machine; (4) covering the side, which is provided with a circuit, of the circuit board with a plastic film; and (5) spraying a coating with the thickness of 5-7 microns on the roughened surface of the circuit board by using the coating machine, and airing to obtain the reflective layer on the surface of the circuit board. According to the technical scheme, the most appropriate surface roughness and reflective coating thickness are selected. Therefore, the reflective effect is ensured, the lighting effect of an LED lamp is improved by 10%-15%, and a better energy-saving effect is achieved. Moreover, the service life of the reflective layer can be effectively prolonged by more than 20%.