A light source system, including at least one laser light source, the laser light source comprising: two laser groups (20a,20b), at least one of the laser groups including at least two lasers (21a, 21b, 21c, 21d), wherein light beams generated by each laser group are in the same direction and parallel to each other; two reflector groups (30a, 30b) corresponding to the two laser groups, at least one of the reflector groups including at least two reflectors (31a, 31b, 31c, 31d), each reflector being disposed on an optical axis of the corresponding laser; each reflector group reflecting the light beams generated by the corresponding laser group, wherein a spacing between light beams output from the reflector group is smaller than a spacing between the light beams inputted to the reflector group; wherein the light beams generated by the two laser groups are parallel to each other, and the light beams output from the two reflector groups are in the same direction and parallel to each other; wherein first projections of the two laser groups on the cross-section of the light beams reflected by the reflectors partially overlap with each other when projected in a first direction as second projections, the first direction being along a line connecting centers of the at least two lasers in the first projection of one of the two laser groups, wherein light spots formed by adjacent light beams from the lasers of different laser groups and after reflection by the reflector are in contact with each other in a second direction, the second direction being parallel to both a cross-section of an incident light of the reflector and a cross-section of an output light of the reflector, wherein the height of the reflectors is equal to the height of the light spots. two laser groups (20a,20b), at least one of the laser groups including at least two lasers (21a, 21b, 21c, 21d), wherein light beams generated by each laser group are in the same direction and parallel to each other; two reflector groups (30a, 30b) corresponding to the two laser groups, at least one of the reflector groups including at least two reflectors (31a, 31b, 31c, 31d), each reflector being disposed on an optical axis of the corresponding laser; each reflector group reflecting the light beams generated by the corresponding laser group, wherein a spacing between light beams output from the reflector group is smaller than a spacing between the light beams inputted to the reflector group; wherein the light beams generated by the two laser groups are parallel to each other, and the light beams output from the two reflector groups are in the same direction and parallel to each other; wherein first projections of the two laser groups on the cross-section of the light beams reflected by the reflectors partially overlap with each other when projected in a first direction as second projections, the first direction being along a line connecting centers of the at least two lasers in the first projection of one of the two laser groups, wherein light spots formed by adjacent light beams from the lasers of different laser groups and after reflection by the reflector are in contact with each other in a second direction, the second direction being parallel to both a cross-section of an incident light of the reflector and a cross-section of an output light of the reflector, wherein the height of the reflectors is equal to the height of the light spots.