Abstract: A linking-up ventilation door/window panel structure is described. The linking-up ventilation door/window panel structure includes a window panel, at least one gear set, and a upper ventilation panel and a lower ventilation panel sliding on the window panel, wherein the at least one gear set has at least a first gear rack and second gear rack. A first gear and a second gear are positioned between the first gear rack and the second gear rack and the two gears are pivotally connected to the window panels or the upper ventilation panel and the lower ventilation panel. The linking-up ventilation door/window panel structure links up the other ventilation panel for ventilating air when the user shifts one of the upper ventilation panel and the lower ventilation panel. The linking-up ventilation door/window panel structure having two gears facilitates the operation stability and reduces the noise formed by the linking-up ventilation door/window panel.