Reflection type multiband laser focusing device

The invention discloses a reflection type multiband laser focusing device. The reflection type multiband laser focusing device comprises a laser I, a laser II and a laser III, wherein a laser beam of the laser II sequentially passes through a focusing lens II, a refraction lens II, an axis of a convex mirror and an axis of a concave mirror and is irradiated to a sample cell, a laser beam of the laser I sequentially passes through a focusing lens I and a refraction lens I and is refracted to the sample cell through first-level refraction of the concave mirror and second-level refraction of the convex mirror, a laser beam of the laser III sequentially passes through a focusing lens III and a refraction lens III and is refracted to the sample cell through the first-level refraction of the concave mirror and the second-level refraction of the convex mirror, and the center of the sample cell is located at the focal point of the convex mirror. According to the reflection type multiband laser focusing device, light waves at different wavebands can be gathered to one point, influence of chromatic aberration is reduced, so that the laser utilization effect is improved, and experiments are assisted; a laser path is simple to construct, the adjustment is convenient, and the repeatability and the adjusting precision are high.