System for testing size of light spot of visible light source and method thereof

The invention relates to a system for testing the size of a light spot of a visible light source, which comprises an irradiation plane 03, an image acquisition unit 02 and a data processing server 01,wherein four mark points are arranged on the irradiation plane 03; the image acquisition unit 02 is connected with the irradiation plane 03; the image acquisition unit 02 is vertical to the center ofthe irradiation plane 03 and is fixed in front of the irradiation plane 03; and the data processing server 01 is connected with the image acquisition unit 02. The invention also relates to a method for realizing the test processing of the size of the light spot of the visible light source. By adopting the system and the method for testing the size of the light spot of the visible light source, the data acquired by the image acquisition unit 02 are analyzed, the light spot diameter sizes of a plurality of light spot center points are respectively calculated, the light spot diameter sizes are averaged to obtain a final