Projection touch system based on infrared laser module

A projection touch control system based on an infrared laser module comprises the infrared laser module used for emitting infrared light covering a projection area; and the projection light machine module comprises an imaging illumination assembly, a PBS prism and a projection lens group which are sequentially arranged along a light path, an S polarized light emergent side of the PBS prism is provided with an LCOS modulation chip, and the LCOS modulation chip is provided with a CMOS camera chip at a symmetrical position relative to a film coating plane of the PBS prism. When a finger of a user slides in the projection area, highlight infrared light spots can be reflected on the finger, and the infrared light spots return along the original path through the projection lens group and are received by the CMOS camera chip after being reflected by the PBS prism. The image information received by the CMOS camera chip is compared with the original image information received by the LCOS modulation chip, so that the s