The invention provides a light path switching system, which at least comprises a vacuum pipeline, a sample system cavity, at least two light source light path cavities and a vacuum regulating cavity, wherein the sample system cavity is arranged at one end of the vacuum pipeline and is used for accommodating a sample to be tested; the at least two light source light path cavities are arranged on the vacuum pipeline and are used for respectively introducing different light sources; each light source light path cavity is provided with an ion pump and a vacuum valve; the vacuum regulating cavity is arranged on the vacuum pipeline and is positioned between the sample system cavity and the light source light path cavities. The light path switching system can solve the problem that all light sources need to be mutually switched after an angle resolved photoemission spectroscopy instrument integrates different exciting light sources; the practical requirement that various light sources can be mutually and freely switched in the test process is met.