The present invention discloses an optical touch panel including a support plate, a light emitting element, an optical fiber, an optical sensing element and a control unit. The optical fiber is arranged on the support plate in a bending manner. A light beam generated by the light emitting element is transmitted through the optical fiber and received by the optical sensing element. When the optical fiber is touched by an object, an optical return is generated within the optical fiber and received by the optical sensing element. As a result, the control unit obtains a contact location where the object located according to the receiving time of the light beam, the receiving time of the optical return and the conduction velocity of the light beam.