Method for determining position of touch point on touch screen and touch screen

The invention discloses a method for determining the position of a touch point on a touch screen and the touch screen, wherein the touch screen comprises a display screen in a polygon structure, and a reflecting mirror is arranged on the inner surface of any one border of the display screen; an image acquiring unit is arranged on the point of intersection of any two borders except the border provided with the reflecting mirror; and when the display screen is touched, the position of a touch point is determined according to the imaging position of the touch point on the image acquiring unit and the imaging position of the reflecting mirror on the image acquiring unit. According to the method and the touch screen disclosed by the invention, the problem of limit on application sizes of various existing touch screen technologies can be solved, and compared with the existing double-image acquiring unit measuring system, the number of the image acquiring unit is reduced, the touch screen is in a simplified structure and is convenient to install, and the position of the image acquiring unit is easier to debug.