A light source system (100, 200), comprising: an excitation light source configured to emit first color laser light; a supplemental light source (120, 220) configured to emit supplemental light of a different color from that of the first color laser light, the supplemental light being laser light; an optical path selecting element (130, 230) comprising: a transmitting portion (132, 232) configured to transmit the first color laser light; an optical path selecting portion (134, 234) configured to reflect the first color laser light in time sequence to a first optical path or a second optical path; and a driving portion configured to drive the transmitting portion (132, 232) and the optical path selecting portion (134, 234) to be alternately located on an optical path of the first color laser light; a first wavelength conversion device configured to generate a second color fluorescent light under excitation of the first color laser light transmitted along the first optical path; and a second wavelength conversion device configured to generate a third color fluorescent light under excitation of the first color laser light transmitted along the second optical path; characterized in that the light source system (100, 200) further comprises a control device, wherein when the transmitting portion (132, 232) is located on the optical path of the first color laser light, the control device controls the supplemental light source (120, 220) not to emit light; and when the optical path selecting portion (134, 234) is located on the optical path of the first color laser light, the control device controls the supplemental light source (120, 220) to emit light; wherein the second color fluorescent light, the third color fluorescent light, the supplemental light, and the first color laser light transmitted by the optical path selecting element (130, 230) are combined and then exit. an excitation light source configured to emit first color laser light; a supplemental light source (120, 220) configured to emit supplemental light of a different color from that of the first color laser light, the supplemental light being laser light; an optical path selecting element (130, 230) comprising: a transmitting portion (132, 232) configured to transmit the first color laser light; an optical path selecting portion (134, 234) configured to reflect the first color laser light in time sequence to a first optical path or a second optical path; and a driving portion configured to drive the transmitting portion (132, 232) and the optical path selecting portion (134, 234) to be alternately located on an optical path of the first color laser light; a transmitting portion (132, 232) configured to transmit the first color laser light; an optical path selecting portion (134, 234) configured to reflect the first color laser light in time sequence to a first optical path or a second optical path; and a driving portion configured to drive the transmitting portion (132, 232) and the optical path selecting portion (134, 234) to be alternately located on an optical path of the first color laser light; a first wavelength conversion device configured to generate a second color fluorescent light under excitation of the first color laser light transmitted along the first optical path; and a second wavelength conversion device configured to generate a third color fluorescent light under excitation of the first color laser light transmitted along the second optical path; characterized in that the light source system (100, 200) further comprises a control device, wherein when the transmitting portion (132, 232) is located on the optical path of the first color laser light, the control device controls the supplemental light source (120, 220) not to emit light; and when the optical path selecting portion (134, 234) is located on the optical path of the first color laser light, the control device controls the supplemental light source (120, 220) to emit light; wherein the second color fluorescent light, the third color fluorescent light, the supplemental light, and the first color laser light transmitted by the optical path selecting element (130, 230) are combined and then exit.