The invention relates to a laser focusing device for a lens during the process of manufacturing a stage lamp, comprising a guide rail, a first slide carriage, a second slide carriage and a third carriage which are arranged on the guide rail; one side of each slide carriage is respectively provided with a fixing button, so that each slide carriage can slide and be fastened on the guide rail; the third slide carriage is provided with an L-shaped support having an upper end provided with a laser emitter module which is provided with a laser; the second slide carriage is provided with a lens support above which a lens is arranged; and the first slide carriage is provided with an L-shaped support having an upper end provided with a laser receiver module which is provided with a laser receiver. The device has the advantages of convenient and simple operation, accurate and direct measurement, low cost, simplified calculation during the designing process, reduced error, improved work efficiency, and accurate measurement for both spherical lens and non-spherical lens.