Touch pen and projecting system

The utility model belongs to the field of office equipment, and particularly relates to a touch pen and a projecting system. The touch pen and the projecting system, provided by the embodiment of the utility model, have the advantages that the pen point part of the touch pen is provided an infrared light emitting device which can generate infrared lights, an infrared signal can be generated by the touch pen when a projecting screen is slightly touched by a user by using the touch pen, related information of a current touch point can be calculated through projecting management software after the infrared signal is captured by an infrared camera which is arranged at the inner part of a projecting module, and a computer can be controlled to complete preset corresponding functions; and meanwhile, the infrared light emitting device can be kept in a light emitting state by pressing a normally-on button which is arranged on a pen holder of the touch pen, a bunch of infrared laser can be generated at the front end of