Large-size optical touch screen

The utility model discloses a large-size optical touch screen, which comprises at least three optical sensors, a frame, a large-size touch surface and a processing unit, wherein at least one optical sensor is mounted on one edge of the frame; and at least one of the optical sensors mounted on the edges of the frame and adopts a compound eye camera provided with a plurality of camera lenses. The large-size optical touch screen can be accurately positioned only through fewer optical sensors.