Optical touch display device

The invention relates to an optical touch display device, which comprises a display panel, a light source module and a sensing module, wherein the display panel has a first side, a second side, a third side and a fourth side; the first side is adjacent to the second side, the third side is opposite to the first side, and the fourth side is opposite to the second side; the light source module is arranged beside the first and second sides of the display panel, and is used for providing first parallel light and second parallel light passing through the upper part of the display surface of the display panel; the first parallel light passes through the third side of the display panel through the first side of the display panel; the second parallel light passes through the fourth side of the display panel through the second side of the display panel; and the sensing module is arranged beside the third and fourth sides of the display panel so as to sense the first and second parallel light. The optical touch display device has better reliability.