A panel curtain comprising: at least one rail set that includes a plurality of parallel sliding rails each of which having a positioning groove and a limiting groove disposed on two lateral surfaces thereof respectively and corresponding to each other, a panel groove arranged at the bottom thereof, and a connecting rib disposed on top thereof and provided with a plurality of punch holes in turn; a sliding block that is fixed on the distal end of the positioning groove of each sliding rail, and slidably mounted in the limiting groove of the adjacent sliding rail; a limiting block that is disposed on the front end of the limiting groove of each sliding rail; a connecting sliding block mounted on the front end of the connecting rib of each sliding rail and provided with a sliding locking portion and a connecting portion whose length varies depending on the position of the sliding rail among the sliding rails in parallel for fixing the connecting sliding block on the connecting rib of the corresponding sliding rail and allowing the sliding locking portions to be aligned and abut against one another; the sliding rail further provided with the frontmost connecting sliding block that includes a cord binding portion; the sliding rail that is defined as the last one according to the sequential arrangement further provided with a positioning block that is arranged at the distal end of the connecting rib thereof; and a plurality of panels each of which is provided with a panel holding portion that is formed on the top thereof and slidably mounted in the panel groove of the sliding rail characterised by an upper track having telescopically adjustable length and provided with an inner track, an outer track, and two rail channels disposed on the inner track and the outer track, respectively at the same side and communicating with each other, and the positioning block is further fixed and limited on the upper track; and a plurality of clips arranged at the top thereof and each of which includes an assembly portion disposed on the lateral surface thereof for fixing two touch fasteners and a curtain fabric affixed to the two touch fasteners; wherein the sliding block is provided with a barrier piece extending downward therefrom for covering one end of the panel groove, wherein the limiting block is provided with a buffer spring and a swiveling stopper that is pivotally mounted on the distal end of the limiting block, and wherein the panel holding portion is limited and positioned by the barrier piece and the swivelling stopper on two ends of the panel groove respectively. at least one rail set that includes a plurality of parallel sliding rails each of which having a positioning groove and a limiting groove disposed on two lateral surfaces thereof respectively and corresponding to each other, a panel groove arranged at the bottom thereof, and a connecting rib disposed on top thereof and provided with a plurality of punch holes in turn; a sliding block that is fixed on the distal end of the positioning groove of each sliding rail, and slidably mounted in the limiting groove of the adjacent sliding rail; a limiting block that is disposed on the front end of the limiting groove of each sliding rail; a connecting sliding block mounted on the front end of the connecting rib of each sliding rail and provided with a sliding locking portion and a connecting portion whose length varies depending on the position of the sliding rail among the sliding rails in parallel for fixing the connecting sliding block on the connecting rib of the corresponding sliding rail and allowing the sliding locking portions to be aligned and abut against one another; the sliding rail further provided with the frontmost connecting sliding block that includes a cord binding portion; the sliding rail that is defined as the last one according to the sequential arrangement further provided with a positioning block that is arranged at the distal end of the connecting rib thereof; and a plurality of panels each of which is provided with a panel holding portion that is formed on the top thereof and slidably mounted in the panel groove of the sliding rail characterised by an upper track having telescopically adjustable length and provided with an inner track, an outer track, and two rail channels disposed on the inner track and the outer track, respectively at the same side and communicating with each other, and the positioning block is further fixed and limited on the upper track; and a plurality of clips arranged at the top thereof and each of which includes an assembly portion disposed on the lateral surface thereof for fixing two touch fasteners and a curtain fabric affixed to the two touch fasteners; wherein the sliding block is provided with a barrier piece extending downward therefrom for covering one end of the panel groove, wherein the limiting block is provided with a buffer spring and a swiveling stopper that is pivotally mounted on the distal end of the limiting block, and wherein the panel holding portion is limited and positioned by the barrier piece and the swivelling stopper on two ends of the panel groove respectively.